WO2021081411A1 - Méthodes et compositions permettant de traiter le syndrome du côlon irritable et la dyspepsie fonctionnelle - Google Patents

Méthodes et compositions permettant de traiter le syndrome du côlon irritable et la dyspepsie fonctionnelle Download PDF

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Publication number
WO2021081411A1
WO2021081411A1 PCT/US2020/057174 US2020057174W WO2021081411A1 WO 2021081411 A1 WO2021081411 A1 WO 2021081411A1 US 2020057174 W US2020057174 W US 2020057174W WO 2021081411 A1 WO2021081411 A1 WO 2021081411A1
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WO
WIPO (PCT)
Prior art keywords
individual
amino acid
seq
antibody
acid sequence
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Application number
PCT/US2020/057174
Other languages
English (en)
Inventor
Bhupinder Singh
Amol KAMBOJ
Henrik Rasmussen
Original Assignee
Allakos Inc.
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Publication date
Priority claimed from PCT/US2020/018405 external-priority patent/WO2020168271A1/fr
Application filed by Allakos Inc. filed Critical Allakos Inc.
Priority to US17/770,439 priority Critical patent/US20220380460A1/en
Priority to EP20880322.1A priority patent/EP4048698A4/fr
Priority to JP2022523912A priority patent/JP2022553378A/ja
Priority to CN202080087957.8A priority patent/CN114829406A/zh
Publication of WO2021081411A1 publication Critical patent/WO2021081411A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2803—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/16—Amides, e.g. hydroxamic acids
    • A61K31/165—Amides, e.g. hydroxamic acids having aromatic rings, e.g. colchicine, atenolol, progabide
    • A61K31/167—Amides, e.g. hydroxamic acids having aromatic rings, e.g. colchicine, atenolol, progabide having the nitrogen of a carboxamide group directly attached to the aromatic ring, e.g. lidocaine, paracetamol
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/4995—Pyrazines or piperazines forming part of bridged ring systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/56—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
    • A61K31/57—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane or progesterone
    • A61K31/573—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane or progesterone substituted in position 21, e.g. cortisone, dexamethasone, prednisone or aldosterone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/395—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/14—Prodigestives, e.g. acids, enzymes, appetite stimulants, antidyspeptics, tonics, antiflatulents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/73—Inducing cell death, e.g. apoptosis, necrosis or inhibition of cell proliferation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/73—Inducing cell death, e.g. apoptosis, necrosis or inhibition of cell proliferation
    • C07K2317/732—Antibody-dependent cellular cytotoxicity [ADCC]

Definitions

  • Siglec-8 a member of the CD33-related family of sialic acid-binding, immunoglobulin-like lectins (Siglecs), is a transmembrane cell surface protein with restricted tissue distribution, expressed selectively on the surface of eosinophils, mast cells and, at lower levels, on basophils.
  • Siglec-8 contains 3 extracellular immunoglobulin-like domains, a transmembrane region, and a cytoplasmic tail containing 2 tyrosine-based signaling motifs including an immunoreceptor tyrosine-based inhibitory motif with inhibitory function.
  • the present disclosure relates, inter alia, to methods of treating or preventing IBS and/or functional dyspepsia by administration of antibodies that bind to human Siglec-8 and/or compositions comprising said antibodies.
  • certain aspects of the present disclosure relate to methods for treating or preventing irritable bowel syndrome (IBS) in an individual, comprising administering to the individual an effective amount of a composition comprising an antibody that binds to human Siglec-8.
  • the individual has, or has been diagnosed with, IBS.
  • prior to administration of the composition the individual has failed or is not adequately controlled by one or more standard-of-care treatments for IBS.
  • one or more symptom(s) of IBS in the individual are reduced after administration of the composition as compared to a baseline level before administration of the composition.
  • one or more of abdominal pain, abdominal cramping, gas, nausea, bloating, diarrhea, constipation, tenesmus, urgency, fecal incontinence, and mucus in stool in the individual are reduced after administration of the composition as compared to a baseline level before administration of the composition.
  • Other aspects of the present disclosure relate to methods for treating or preventing functional dyspepsia in an individual, comprising administering to the individual an effective amount of a composition comprising an antibody that binds to human Siglec-8.
  • the individual has, or has been diagnosed with, functional dyspepsia. In some embodiments, prior to administration of the composition, the individual has failed or is not adequately controlled by one or more standard-of-care treatments for functional dyspepsia. In some embodiments, one or more symptom(s) of functional dyspepsia in the individual are reduced after administration of the composition as compared to a baseline level before administration of the composition. In some embodiments, one or more of abdominal discomfort or burning sensation, bloating, post-prandial pain, belching, early feelings of satiety, vomiting, and nausea in the individual are reduced after administration of the composition as compared to a baseline level before administration of the composition.
  • one or both of a number or activity of mast cells in a sample obtained from the gastric, duodenal, jejunal, ileal, or colonic mucosa of the individual are reduced after administration of the composition as compared to a baseline level before administration of the composition.
  • one or both of a number or activity of eosinophils in a sample obtained from the gastric, duodenal, jejunal, ileal, or colonic mucosa of the individual are reduced after administration of the composition as compared to a baseline level before administration of the composition.
  • the composition is administered by subcutaneous injection.
  • the composition is administered by intravenous infusion.
  • the composition is administered by intravenous infusion once a month for 3 or more months, every 4 weeks, or every 28 days.
  • the composition is administered by intravenous infusion once per cycle for 1, 2, 3, 4, 5, or 6 cycles, wherein each cycle is 1 month, 4 weeks, or 28 days.
  • the composition is administered by subcutaneous injection.
  • the composition is administered by intravenous infusion at one or more doses comprising between about 0.3 mg/kg and about 3.0 mg/kg of the antibody.
  • the method comprises administering to the individual a first dose comprising about 0.3 mg/kg of the antibody, a second dose comprising about 1.0 mg/kg of the antibody, and a third dose comprising about 3.0 mg/kg of the antibody.
  • the method comprises administering to the individual a first dose comprising about 0.3 mg/kg of the antibody on Day 1, a second dose comprising about 1.0 mg/kg of the antibody between Day 26 and Day 32, a third dose comprising about 3.0 mg/kg of the antibody between Day 54 and Day 60, a fourth dose comprising about 3.0 mg/kg of the antibody between Day 82 and Day 88, a fifth dose comprising about 3.0 mg/kg of the antibody between Day 110 and Day 116, and a sixth dose comprising about 3.0 mg/kg of the antibody between Day 138 and Day 144.
  • the methods comprise administering to the individual a first dose of the composition comprising the antibody that binds to human Siglec-8.
  • the methods comprise administering a corticosteroid to the individual; and at least 6 hours after administering the corticosteroid, administering to the individual a first dose of the composition comprising the antibody that binds to human Siglec-8.
  • the methods comprise administering to the individual a first dose of the composition comprising the antibody that binds to human Siglec-8, wherein a corticosteroid is administered to the individual at least 6 hours prior to administration of the first dose.
  • the methods comprise administering to the individual a first dose of the composition, wherein the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours.
  • a corticosteroid is administered to the individual at least 6 hours prior to administration of the first dose.
  • the individual is a human.
  • the corticosteroid is administered to the individual at least 12 hours prior to administration of the first dose.
  • the corticosteroid is administered to the individual within 24 hours prior to administration of the first dose.
  • the corticosteroid is administered to the individual 12-24 hours prior to administration of the first dose.
  • the corticosteroid is prednisone, cortisone, dexamethasone, hydrocortisone, methylprednisolone, or prednisolone.
  • greater than 0.5mg/kg prednisone is administered to the individual at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), or 12-24 hours prior to administration of the first dose.
  • 0.5mg/kg to 1mg/kg prednisone is administered to the individual at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), or 12-24 hours prior to administration of the first dose.
  • 1mg/kg prednisone is administered to the individual at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), or 12- 24 hours prior to administration of the first dose.
  • 80mg prednisone is administered to the individual at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), or 12-24 hours prior to administration of the first dose.
  • 60mg prednisone is administered to the individual at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), or 12-24 hours prior to administration of the first dose.
  • the corticosteroid is self- administered by the individual.
  • the corticosteroid is administered orally to the individual.
  • administration of the corticosteroid at least 6 hours prior to administration of the first dose reduces the risk and/or severity of infusion-related reaction (IRR) in the individual, as compared to administration of the first dose without administration of the corticosteroid at least 6 hours prior.
  • administration of the corticosteroid at least 12 hours prior to administration of the first dose reduces the risk and/or severity of infusion-related reaction (IRR) in the individual, as compared to administration of the first dose without administration of the corticosteroid at least 12 hours prior.
  • administering reduces the risk and/or severity of infusion-related reaction (IRR) in the individual, as compared to administration of the first dose without administration of the corticosteroid 12-24 hours prior.
  • IRR infusion-related reaction
  • the antibody that binds to human Siglec-8 is administered to the individual at between 0.1mg/kg and 10mg/kg in the first dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at between about 1mg/kg and about 3mg/kg in the first dose.
  • the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg or 3mg/kg in the first dose.
  • the first dose of the composition is administered intravenously to the individual.
  • the first dose of the composition is administered subcutaneously to the individual.
  • the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours. In some embodiments, less than 50% of total volume of the first dose is administered to the individual in the first 2 hours of the infusion. In some embodiments, less than 30% of total volume of the first dose is administered to the individual in the first 2 hours of the infusion.
  • the first dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 1 mL/hour for 15 minutes, 5 mL/hour for 15 minutes, 10 mL/hour for 30 minutes, 15 mL/hour for 30 minutes, 25 mL/hour for 30 minutes, 30 mL/hour for 30 minutes, 35 mL/hour for 30 minutes, and 40 mL/hour for 62 minutes.
  • administration of the first dose of the composition by intravenous infusion over a period of about 4 hours reduces the risk of infusion-related reaction (IRR) in the individual, as compared to administration of the first dose by intravenous infusion over a period that is less than about 4 hours.
  • IRR infusion-related reaction
  • administration of the first dose of the composition by intravenous infusion over a period of about 4 hours reduces the severity of infusion-related reaction (IRR) in the individual, as compared to administration of the first dose by intravenous infusion over a period that is less than about 4 hours.
  • the methods further comprise administering a corticosteroid to the individual 1-2 hours prior to administration of the first dose.
  • the corticosteroid administered to the individual 1-2 hours prior to administration of the first dose is prednisone, cortisone, dexamethasone, hydrocortisone, methylprednisolone, or prednisolone.
  • greater than 0.5mg/kg prednisone is administered to the individual 1-2 hours prior to administration of the first dose. In some embodiments, 0.5mg/kg to 1mg/kg prednisone is administered to the individual 1-2 hours prior to administration of the first dose. In some embodiments, greater than 1mg/kg prednisone is administered to the individual 1-2 hours prior to administration of the first dose. In some embodiments, 60mg or 80mg prednisone is administered to the individual 1-2 hours prior to administration of the first dose. In some embodiments, the corticosteroid is administered orally to the individual. In some embodiments, the corticosteroid administered to the individual 1-2 hours prior to administration of the first dose is methylprednisolone.
  • 100mg methylprednisolone is administered to the individual 1-2 hours prior to administration of the first dose.
  • the corticosteroid is administered intravenously to the individual.
  • the methods further comprise administering an antihistamine to the individual 1-2 hours prior to administration of the first dose.
  • the antihistamine is cetirizine.
  • 10mg cetirizine is administered to the individual 1-2 hours prior to administration of the first dose.
  • 10mg cetirizine is administered to the individual no less than 40 minutes and no more than 180 minutes prior to administration of the first dose.
  • 10mg cetirizine is administered to the individual 40 minutes to 180 minutes prior to administration of the first dose (e.g., inclusive of 40 minutes and 180 minutes).
  • the antihistamine is administered orally to the individual.
  • the methods further comprise administering an antipyretic or non-steroidal anti-inflammatory drug (NSAID) to the individual 1-2 hours prior to administration of the first dose.
  • NSAID non-steroidal anti-inflammatory drug
  • the antipyretic is acetaminophen.
  • 975-1000mg acetaminophen is administered to the individual 1-2 hours prior to administration of the first dose.
  • the methods further comprise administering to the individual a second dose of a composition comprising an antibody that binds to human Siglec-8.
  • the second dose is administered to the individual about 28 days after the first dose.
  • the second dose is administered to the individual about 4 weeks after the first dose.
  • the second dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours.
  • the second dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 1 mL/hour for 15 minutes, 5 mL/hour for 15 minutes, 10 mL/hour for 30 minutes, 15 mL/hour for 30 minutes, 25 mL/hour for 30 minutes, 30 mL/hour for 30 minutes, 35 mL/hour for 30 minutes, and 40 mL/hour for 62 minutes.
  • the second dose is administered to the individual without administration of a corticosteroid to the individual at least 6 hours, at least 12 hours, 6-24 hours, or 12-24 hours prior to administration of the second dose.
  • a corticosteroid is administered to the individual 1-2 hours, at least 6 hours, at least 12 hours, 6-24 hours, or 12-24 hours prior to administration of the second dose.
  • a corticosteroid is administered to the individual at least 6 hours, at least 12 hours, 6-24 hours, or 12-24 hours prior to administration of the second dose.
  • the corticosteroid is prednisone, cortisone, dexamethasone, hydrocortisone, methylprednisolone, or prednisolone.
  • greater than 0.5mg/kg prednisone is administered to the individual at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), or 12-24 hours prior to administration of the second dose.
  • 1mg/kg prednisone is administered to the individual at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), or 12-24 hours prior to administration of the second dose.
  • 80mg prednisone is administered to the individual at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), or 12-24 hours prior to administration of the second dose.
  • the corticosteroid is self- administered by the individual. In some embodiments, the corticosteroid is administered orally to the individual.
  • the antibody that binds to human Siglec-8 is administered to the individual at between 0.1mg/kg and 10mg/kg in the second dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at between about 1mg/kg and about 3mg/kg in the second dose.
  • the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg or 3mg/kg in the second dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg in the first dose and at 3mg/kg in the second dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 3mg/kg in the first dose and at 10mg/kg in the second dose. In some embodiments, the second dose of the composition is administered intravenously to the individual. In some embodiments, the second dose of the composition is administered subcutaneously to the individual.
  • the methods further comprise administering a corticosteroid to the individual 1-2 hours prior to administration of the second dose.
  • the corticosteroid administered to the individual 1-2 hours prior to administration of the second dose is methylprednisolone.
  • 100mg methylprednisolone is administered to the individual 1-2 hours prior to administration of the second dose.
  • the methods further comprise administering an antihistamine to the individual 1-2 hours prior to administration of the second dose.
  • 10mg cetirizine is administered to the individual 1-2 hours prior to administration of the second dose.
  • the antihistamine is administered orally to the individual.
  • the methods further comprise administering an antipyretic or non-steroidal anti-inflammatory drug (NSAID) to the individual 1-2 hours prior to administration of the second dose.
  • NSAID non-steroidal anti-inflammatory drug
  • the antipyretic is acetaminophen.
  • 975-1000mg acetaminophen is administered to the individual 1-2 hours prior to administration of the second dose.
  • the antipyretic or NSAID is administered orally to the individual.
  • the methods further comprise administering to the individual a third dose of a composition comprising an antibody that binds to human Siglec-8. In some embodiments, the third dose is administered to the individual about 28 days after the second dose.
  • the third dose is administered to the individual about 4 weeks after the second dose. In some embodiments, the third dose is administered to the individual about 56 days after the first dose. In some embodiments, the third dose is administered to the individual about 8 weeks after the first dose. In some embodiments, the third dose of the composition is administered to the individual by intravenous infusion over a period of about 2 hours to about 4 hours. In some embodiments, the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 hour to about 4 hours. In some embodiments, the third dose of the composition is administered to the individual by intravenous infusion over a period of about 2 hours.
  • the third dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 10 mL/hour for 30 minutes, 25 mL/hour for 15 minutes, 40 mL/hour for 15 minutes, 55 mL/hour for 15 minutes, 70 mL/hour for 15 minutes, 85 mL/hour for 15 minutes, and 100 mL/hour for 16 minutes.
  • the third dose of the composition is administered to the individual by intravenous infusion over a period of about 3 hours.
  • the third dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 2 mL/hour for 30 minutes, 10 mL/hour for 30 minutes, 20 mL/hour for 30 minutes, 40 mL/hour for 30 minutes, and 60 mL/hour for 64 minutes.
  • the third dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours.
  • the third dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 1 mL/hour for 15 minutes, 5 mL/hour for 15 minutes, 10 mL/hour for 30 minutes, 15 mL/hour for 30 minutes, 25 mL/hour for 30 minutes, 30 mL/hour for 30 minutes, 35 mL/hour for 30 minutes, and 40 mL/hour for 62 minutes.
  • the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 hour.
  • the third dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 24 mL/hour for 15 minutes, and 125.3 mL/hour for 45 minutes.
  • the third dose is administered to the individual without administration of a corticosteroid to the individual at least 6 hours, at least 12 hours, 6- 24 hours, or 12-24 hours prior to administration of the third dose.
  • a corticosteroid is administered to the individual 1-2 hours, at least 6 hours, at least 12 hours, 6-24 hours, or 12-24 hours prior to administration of the third dose.
  • the methods comprise: administering to the individual a first dose of the composition on Day 1, wherein the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours (optionally wherein a corticosteroid is administered to the individual at least 6 hours prior to administration of the first dose); administering to the individual a second dose of the composition on Day 29 ( ⁇ 3 days), wherein the second dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours; and administering to the individual a third dose of the composition on Day 57 ( ⁇ 3 days), wherein the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 to about 4 hours, about 2 to about 4 hours, or about any of 1 hour, 2 hours, or 4 hours (e.g., as described herein).
  • the methods comprise: administering to the individual a first dose of the composition on Week 1, wherein the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours (optionally wherein a corticosteroid is administered to the individual at least 6 hours prior to administration of the first dose); administering to the individual a second dose of the composition on Week 4 ( ⁇ 3 days), wherein the second dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours; and administering to the individual a third dose of the composition on Week 8 ( ⁇ 3 days), wherein the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 to about 4 hours, about 2 to about 4 hours, or about any of 1 hour, 2 hours, or 4 hours (e.g., as described herein).
  • the methods further comprise administering to the individual one, two, three, or more additional doses of a composition comprising an antibody that binds to human Siglec-8, wherein a first of the additional dose(s) is administered to the individual about 28 days or about 4 weeks after the third dose, and wherein any subsequent additional dose(s) are administered to the individual at an interval of about 28 days or about 4 weeks.
  • the methods further comprise administering to the individual a fourth dose of a composition comprising an antibody that binds to human Siglec-8. In some embodiments, the fourth dose is administered to the individual about 28 days after the third dose.
  • the fourth dose is administered to the individual about 4 weeks after the third dose. In some embodiments, the fourth dose is administered to the individual about 56 days after the second dose. In some embodiments, the fourth dose is administered to the individual about 8 weeks after the second dose. In some embodiments, the fourth dose is administered to the individual about 84 days after the first dose. In some embodiments, the fourth dose is administered to the individual about 12 weeks after the first dose. In some embodiments, the fourth dose of the composition is administered to the individual by intravenous infusion over a period of about 2 hours to about 4 hours. In some embodiments, the fourth dose of the composition is administered to the individual by intravenous infusion over a period of about 1 hour to about 4 hours.
  • the fourth dose of the composition is administered to the individual by intravenous infusion over a period of about 2 hours. In some embodiments, the fourth dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 10 mL/hour for 30 minutes, 25 mL/hour for 15 minutes, 40 mL/hour for 15 minutes, 55 mL/hour for 15 minutes, 70 mL/hour for 15 minutes, 85 mL/hour for 15 minutes, and 100 mL/hour for 16 minutes. In some embodiments, the fourth dose of the composition is administered to the individual by intravenous infusion over a period of about 3 hours.
  • the fourth dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 2 mL/hour for 30 minutes, 10 mL/hour for 30 minutes, 20 mL/hour for 30 minutes, 40 mL/hour for 30 minutes, and 60 mL/hour for 64 minutes.
  • the fourth dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours.
  • the fourth dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 1 mL/hour for 15 minutes, 5 mL/hour for 15 minutes, 10 mL/hour for 30 minutes, 15 mL/hour for 30 minutes, 25 mL/hour for 30 minutes, 30 mL/hour for 30 minutes, 35 mL/hour for 30 minutes, and 40 mL/hour for 62 minutes.
  • the fourth dose of the composition is administered to the individual by intravenous infusion over a period of about 1 hour.
  • the fourth dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 24 mL/hour for 15 minutes, and 125.3 mL/hour for 45 minutes.
  • the methods comprise: administering to the individual a first dose of the composition on Day 1, wherein the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours (optionally wherein a corticosteroid is administered to the individual at least 6 hours prior to administration of the first dose); administering to the individual a second dose of the composition on Day 29 ( ⁇ 3 days), wherein the second dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours; administering to the individual a third dose of the composition on Day 57 ( ⁇ 3 days), wherein the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 to about 4 hours, about 2 to about 4 hours, or about any of 1 hour, 2 hours, or 4 hours (e.g.,
  • the methods comprise: administering to the individual a first dose of the composition on Week 1, wherein the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours (optionally wherein a corticosteroid is administered to the individual at least 6 hours prior to administration of the first dose); administering to the individual a second dose of the composition on Week 4 ( ⁇ 3 days), wherein the second dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours; administering to the individual a third dose of the composition on Week 8 ( ⁇ 3 days), wherein the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 to about 4 hours, about 2 to about 4 hours, or about any of 1 hour, 2 hours, or 4 hours (e.g., as described herein); and administering to the individual a fourth dose of the composition on Week 12 ( ⁇ 3 days), wherein the fourth dose of the composition is administered to the individual by intravenous infusion over a period of
  • the methods comprise: administering to the individual a first dose of the composition on Day 1, wherein the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours (optionally wherein a corticosteroid is administered to the individual at least 6 hours prior to administration of the first dose); administering to the individual a second dose of the composition on Day 29 ( ⁇ 3 days), wherein the second dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours; administering to the individual a third dose of the composition on Day 57 ( ⁇ 3 days), wherein the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 to about 4 hours, about 2 to about 4 hours, or about any of 1 hour, 2 hours, or 4 hours (e.g., as described herein); administering to the individual a fourth dose of the composition on Day 85 ( ⁇ 3 days), wherein the fourth dose of the composition is administered to the individual by intravenous infusion over a period of
  • the methods comprise: administering to the individual a first dose of the composition on Week 1, wherein the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours (optionally wherein a corticosteroid is administered to the individual at least 6 hours prior to administration of the first dose); administering to the individual a second dose of the composition on Week 4 ( ⁇ 3 days), wherein the second dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours; administering to the individual a third dose of the composition on Week 8 ( ⁇ 3 days), wherein the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 to about 4 hours, about 2 to about 4 hours, or about any of 1 hour, 2 hours, or 4 hours (e.g., as described herein); administering to the individual a fourth dose of the composition on Week 12 ( ⁇ 3 days), wherein the fourth dose of the composition is administered to the individual by intravenous infusion over a period of about
  • the antibody comprises a Fc region and N-glycoside-linked carbohydrate chains linked to the Fc region, wherein less than 50% of the N-glycoside-linked carbohydrate chains of the antibody in the composition contain a fucose residue. In some embodiments, substantially none of the N-glycoside-linked carbohydrate chains of the antibody in the composition contain a fucose residue.
  • the antibody comprises a heavy chain variable region and a light chain variable region, wherein the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:61, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:62, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:63; and/or wherein the light chain variable region comprises (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:64, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:65, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:66.
  • the antibody comprises a heavy chain variable region and a light chain variable region, wherein the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:61, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:62, and (iii) HVR-H3 comprising the amino acid sequence selected from SEQ ID NOs:67-70; and/or wherein the light chain variable region comprises (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:64, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:65, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:71.
  • the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:61, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:62, and (iii) HVR-H3 comprising the amino acid sequence selected from SEQ
  • the antibody comprises a heavy chain variable region comprising the amino acid sequence of SEQ ID NO:6; and/or a light chain variable region comprising the amino acid sequence selected from SEQ ID NO:16 or 21. In some embodiments, the antibody comprises a heavy chain variable region comprising the amino acid sequence selected from SEQ ID NOs:11- 14; and/or a light chain variable region comprising the amino acid sequence selected from SEQ ID NOs:23-24. In some embodiments, the antibody comprises a heavy chain variable region comprising the amino acid sequence selected from SEQ ID NOs:2-14; and/or a light chain variable region comprising the amino acid sequence selected from SEQ ID NOs:16-24.
  • the antibody comprises a heavy chain variable region comprising the amino acid sequence selected from SEQ ID NOs:2-10; and/or a light chain variable region comprising the amino acid sequence selected from SEQ ID NOs:16-22.
  • the antibody comprises: (a) heavy chain variable region comprising: (1) an HC-FR1 comprising the amino acid sequence selected from SEQ ID NOs:26-29; (2) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:61; (3) an HC-FR2 comprising the amino acid sequence selected from SEQ ID NOs:31-36; (4) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:62; (5) an HC-FR3 comprising the amino acid sequence selected from SEQ ID NOs:38-43; (6) an HVR- H3 comprising the amino acid sequence of SEQ ID NO:63; and (7) an HC-FR4 comprising the amino acid sequence selected from SEQ ID NOs:45-46, and/or (b) a light chain variable region comprising: (1) an
  • the antibody comprises: (a) heavy chain variable region comprising: (1) an HC-FR1 comprising the amino acid sequence of SEQ ID NO:26; (2) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:61; (3) an HC-FR2 comprising the amino acid sequence of SEQ ID NO:34; (4) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:62; (5) an HC-FR3 comprising the amino acid sequence of SEQ ID NO:38; (6) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:63; and (7) an HC-FR4 comprising the amino acid sequence of SEQ ID NOs:45; and/or (b) a light chain variable region comprising: (1) an LC-FR1 comprising the amino acid sequence of SEQ ID NO:48; (2) an HVR- L1 comprising the amino acid sequence of SEQ ID NO:64; (3) an LC-FR2 comprising the amino acid sequence of SEQ ID NO:51; (4) an HVR
  • the antibody comprises: (a) heavy chain variable region comprising: (1) an HC-FR1 comprising the amino acid sequence of SEQ ID NO:26; (2) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:61; (3) an HC-FR2 comprising the amino acid sequence of SEQ ID NO:34; (4) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:62; (5) an HC-FR3 comprising the amino acid sequence of SEQ ID NO:38; (6) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:63; and (7) an HC-FR4 comprising the amino acid sequence of SEQ ID NOs:45; and/or (b) a light chain variable region comprising: (1) an LC-FR1 comprising the amino acid sequence of SEQ ID NO:48; (2) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:64; (3) an LC-FR2 comprising the amino acid sequence of SEQ ID NO:51; (4) an HVR
  • the antibody comprises: a heavy chain variable region comprising (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:88, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:91, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:94; and/or a light chain variable region comprising (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:97, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:100, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:103; a heavy chain variable region comprising (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:89, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:92, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:95; and/or a light chain variable region
  • the antibody comprises: a heavy chain variable region comprising the amino acid sequence of SEQ ID NO:106; and/or a light chain variable region comprising the amino acid sequence of SEQ ID NO:109; a heavy chain variable region comprising the amino acid sequence of SEQ ID NO:107; and/or a light chain variable region comprising the amino acid sequence of SEQ ID NO:110; or a heavy chain variable region comprising the amino acid sequence of SEQ ID NO:108; and/or a light chain variable region comprising the amino acid sequence of SEQ ID NO:111.
  • the antibody binds to a human Siglec-8 and a non-human primate Siglec-8.
  • the non-human primate is a baboon.
  • the antibody binds to an epitope in Domain 1 of human Siglec-8, wherein Domain 1 comprises the amino acid sequence of SEQ ID NO:112. In some embodiments, the antibody binds to an epitope in Domain 3 of human Siglec-8, wherein Domain 3 comprises the amino acid sequence of SEQ ID NO:114. In some embodiments, the antibody binds to the same epitope as antibody 4F11. In some embodiments, the antibody binds to an epitope in Domain 2 or Domain 3 of human Siglec-8. In some embodiments, Domain 2 comprises the amino acid sequence of SEQ ID NO:113. In some embodiments, the antibody binds to the same epitope as antibody 1C3.
  • Domain 3 comprises the amino acid sequence of SEQ ID NO:114.
  • the antibody binds to the same epitope as antibody 1H10.
  • the antibody binds to an epitope in Domain 1 of human Siglec-8 and competes with antibody 4F11 for binding to Siglec-8.
  • the antibody does not compete with antibody 2E2 for binding to Siglec-8.
  • the antibody is not antibody 2E2.
  • Domain 1 comprises the amino acid sequence of SEQ ID NO:112.
  • the antibody is a human antibody, a humanized antibody, or a chimeric antibody.
  • the antibody comprises a heavy chain Fc region comprising a human IgG Fc region.
  • the human IgG Fc region comprises a human IgG1 Fc region. In some embodiments, the human IgG1 Fc region is non-fucosylated. In some embodiments, the human IgG Fc region comprises a human IgG4 Fc region. In some embodiments, the human IgG4 Fc region comprises the amino acid substitution S228P, wherein the amino acid residues are numbered according to the EU index as in Kabat. In some embodiments, the antibody depletes blood eosinophils and/or inhibits mast cell activation. In some embodiments, the antibody has been engineered to improve antibody-dependent cell- mediated cytotoxicity (ADCC) activity.
  • ADCC antibody-dependent cell- mediated cytotoxicity
  • the antibody comprises at least one amino acid substitution in the Fc region that improves ADCC activity. In some embodiments, at least one or two of the heavy chains of the antibody is non-fucosylated. In some embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO:75; and/or a light chain comprising the amino acid sequence selected from SEQ ID NO:76 or 77. In some embodiments, the antibody is a monoclonal antibody. [0022] In some embodiments that may be combined with any other embodiments described herein, the composition is administered in combination with one or more additional therapeutic agent(s) for treating or preventing IBS and/or functional dyspepsia. In some embodiments, the individual is a human.
  • the composition is a pharmaceutical composition comprising the antibody and a pharmaceutically acceptable carrier.
  • articles of manufacture or kits comprising a medicament comprising a composition comprising an antibody that binds to human Siglec-8 and a package insert comprising instructions for administration of the medicament in an individual in need thereof according to any one of the above embodiments.
  • articles of manufacture or kits comprising a medicament comprising an antibody that binds to human Siglec-8 and a package insert comprising instructions for administration of the medicament in an individual in need thereof according to any one of the above embodiments.
  • antibody includes polyclonal antibodies, monoclonal antibodies (including full length antibodies which have an immunoglobulin Fc region), antibody compositions with polyepitopic specificity, multispecific antibodies (e.g., bispecific antibodies, diabodies, and single-chain molecules), as well as antibody fragments (e.g., Fab, F(ab')2, and Fv).
  • immunoglobulin Ig
  • the basic 4-chain antibody unit is a heterotetrameric glycoprotein composed of two identical light (L) chains and two identical heavy (H) chains.
  • IgM antibody consists of 5 of the basic heterotetramer units along with an additional polypeptide called a J chain, and contains 10 antigen binding sites, while IgA antibodies comprise from 2-5 of the basic 4-chain units which can polymerize to form polyvalent assemblages in combination with the J chain.
  • the 4-chain unit is generally about 150,000 daltons.
  • Each L chain is linked to an H chain by one covalent disulfide bond, while the two H chains are linked to each other by one or more disulfide bonds depending on the H chain isotype.
  • Each H and L chain also has regularly spaced intrachain disulfide bridges.
  • Each H chain has at the N-terminus, a variable domain (VH) followed by three constant domains (CH) for each of the D and J chains and four CH domains for P and H ⁇ isotypes.
  • Each L chain has at the N-terminus, a variable domain (VL) followed by a constant domain at its other end. The VL is aligned with the VH and the CL is aligned with the first constant domain of the heavy chain (C H 1). Particular amino acid residues are believed to form an interface between the light chain and heavy chain variable domains.
  • the pairing of a VH and V L together forms a single antigen-binding site.
  • immunoglobulins can be assigned to different classes or isotypes. There are five classes of immunoglobulins: IgA, IgD, IgE, IgG and IgM, having heavy chains designated D, G, H, J and P, respectively.
  • the J and D classes are further divided into subclasses on the basis of relatively minor differences in the CH sequence and function, e.g., humans express the following subclasses: IgG1, IgG2, IgG3, IgG4, IgA1 and IgA2.
  • IgG1 antibodies can exist in multiple polymorphic variants termed allotypes (reviewed in Jefferis and Lefranc 2009. mAbs Vol 1 Issue 41-7) any of which are suitable for use in the present disclosure. Common allotypic variants in human populations are those designated by the letters a, f, n, z.
  • an “isolated” antibody is one that has been identified, separated and/or recovered from a component of its production environment (e.g., naturally or recombinantly).
  • the isolated polypeptide is free of association with all other components from its production environment.
  • Contaminant components of its production environment such as that resulting from recombinant transfected cells, are materials that would typically interfere with research, diagnostic or therapeutic uses for the antibody, and may include enzymes, hormones, and other proteinaceous or non-proteinaceous solutes.
  • the polypeptide is purified: (1) to greater than 95% by weight of antibody as determined by, for example, the Lowry method, and in some embodiments, to greater than 99% by weight; (1) to a degree sufficient to obtain at least 15 residues of N-terminal or internal amino acid sequence by use of a spinning cup sequenator, or (3) to homogeneity by SDS-PAGE under non-reducing or reducing conditions using Coomassie blue or silver stain.
  • Isolated antibody includes the antibody in situ within recombinant cells since at least one component of the antibody’s natural environment will not be present. Ordinarily, however, an isolated polypeptide or antibody is prepared by at least one purification step.
  • monoclonal antibody refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical except for possible naturally occurring mutations and/or post- translation modifications (e.g., isomerizations, amidations) that may be present in minor amounts.
  • monoclonal antibodies have a C-terminal cleavage at the heavy chain and/or light chain. For example, 1, 2, 3, 4, or 5 amino acid residues are cleaved at the C- terminus of heavy chain and/or light chain. In some embodiments, the C-terminal cleavage removes a C-terminal lysine from the heavy chain.
  • monoclonal antibodies have an N-terminal cleavage at the heavy chain and/or light chain. For example, 1, 2, 3, 4, or 5 amino acid residues are cleaved at the N-terminus of heavy chain and/or light chain.
  • monoclonal antibodies are highly specific, being directed against a single antigenic site. In some embodiments, monoclonal antibodies are highly specific, being directed against multiple antigenic sites (such as a bispecific antibody or a multispecific antibody).
  • the modifier “monoclonal” indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method.
  • the monoclonal antibodies to be used in accordance with the present disclosure may be made by a variety of techniques, including, for example, the hybridoma method, recombinant DNA methods, phage-display technologies, and technologies for producing human or human-like antibodies in animals that have parts or all of the human immunoglobulin loci or genes encoding human immunoglobulin sequences.
  • naked antibody refers to an antibody that is not conjugated to a cytotoxic moiety or radiolabel.
  • full-length antibody “intact antibody” or “whole antibody” are used interchangeably to refer to an antibody in its substantially intact form, as opposed to an antibody fragment.
  • antibody fragment comprises a portion of an intact antibody, the antigen binding and/or the variable region of the intact antibody.
  • antibody fragments include Fab, Fab', F(ab')2 and Fv fragments; diabodies; linear antibodies (see U.S. Pat. No.5,641,870, Example 2; Zapata et al., Protein Eng.8(10): 1057-1062 [1995]); single-chain antibody molecules and multispecific antibodies formed from antibody fragments.
  • Papain digestion of antibodies produced two identical antigen-binding fragments, called “Fab” fragments, and a residual “Fc” fragment, a designation reflecting the ability to crystallize readily.
  • the Fab fragment consists of an entire L chain along with the variable region domain of the H chain (VH), and the first constant domain of one heavy chain (CH1).
  • VH variable region domain of the H chain
  • CH1 first constant domain of one heavy chain
  • Each Fab fragment is monovalent with respect to antigen binding, i.e., it has a single antigen-binding site.
  • Pepsin treatment of an antibody yields a single large F(ab') 2 fragment which roughly corresponds to two disulfide linked Fab fragments having different antigen-binding activity and is still capable of cross-linking antigen.
  • Fab' fragments differ from Fab fragments by having a few additional residues at the carboxy terminus of the CH1 domain including one or more cysteines from the antibody hinge region.
  • Fab'-SH is the designation herein for Fab' in which the cysteine residue(s) of the constant domains bear a free thiol group.
  • F(ab')2 antibody fragments originally were produced as pairs of Fab' fragments which have hinge cysteines between them. Other chemical couplings of antibody fragments are also known.
  • the Fc fragment comprises the carboxy-terminal portions of both H chains held together by disulfides.
  • Fc Fc receptors
  • Single-chain Fv also abbreviated as “sFv” or “scFv” are antibody fragments that comprise the VH and VL antibody domains connected into a single polypeptide chain.
  • the sFv polypeptide further comprises a polypeptide linker between the VH and VL domains which enables the sFv to form the desired structure for antigen binding.
  • “Functional fragments” of the antibodies of the present disclosure comprise a portion of an intact antibody, generally including the antigen binding or variable region of the intact antibody or the Fv region of an antibody which retains or has modified FcR binding capability.
  • antibody fragments include linear antibody, single-chain antibody molecules and multispecific antibodies formed from antibody fragments.
  • the monoclonal antibodies herein specifically include “chimeric” antibodies (immunoglobulins) in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is (are) identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (U.S. Pat. No.4,816,567; Morrison et al., Proc. Natl. Acad. Sci. USA, 81:6851-6855 (1984)).
  • chimeric antibodies immunoglobulins in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is (are) identical with or homolog
  • Chimeric antibodies of interest herein include PRIMATIZED ® antibodies wherein the antigen-binding region of the antibody is derived from an antibody produced by, e.g., immunizing macaque monkeys with an antigen of interest.
  • “humanized antibody” is used as a subset of “chimeric antibodies.”
  • “Humanized” forms of non-human (e.g., murine) antibodies are chimeric antibodies that contain minimal sequence derived from non-human immunoglobulin.
  • a humanized antibody is a human immunoglobulin (recipient antibody) in which residues from an HVR of the recipient are replaced by residues from an HVR of a non-human species (donor antibody) such as mouse, rat, rabbit or non-human primate having the desired specificity, affinity, and/or capacity.
  • donor antibody such as mouse, rat, rabbit or non-human primate having the desired specificity, affinity, and/or capacity.
  • FR residues of the human immunoglobulin are replaced by corresponding non-human residues.
  • humanized antibodies may comprise residues that are not found in the recipient antibody or in the donor antibody. These modifications may be made to further refine antibody performance, such as binding affinity.
  • a humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the hypervariable loops correspond to those of a non-human immunoglobulin sequence, and all or substantially all of the FR regions are those of a human immunoglobulin sequence, although the FR regions may include one or more individual FR residue substitutions that improve antibody performance, such as binding affinity, isomerization, immunogenicity, etc.
  • the number of these amino acid substitutions in the FR are no more than 6 in the H chain, and in the L chain, no more than 3.
  • the humanized antibody optionally will also comprise at least a portion of an immunoglobulin constant region (Fc), typically that of a human immunoglobulin.
  • Fc immunoglobulin constant region
  • humanized antibodies are directed against a single antigenic site.
  • humanized antibodies are directed against multiple antigenic sites.
  • An alternative humanization method is described in U.S. Pat. No.7,981,843 and U.S. Patent Application Publication No.2006/0134098.
  • the “variable region” or “variable domain” of an antibody refers to the amino-terminal domains of the heavy or light chain of the antibody.
  • the variable domains of the heavy chain and light chain may be referred to as “VH” and “VL”, respectively. These domains are generally the most variable parts of the antibody (relative to other antibodies of the same class) and contain the antigen binding sites.
  • hypervariable region when used herein refers to the regions of an antibody-variable domain that are hypervariable in sequence and/or form structurally defined loops.
  • antibodies comprise six HVRs; three in the VH (H1, H2, H3), and three in the VL (L1, L2, L3).
  • H3 and L3 display the most diversity of the six HVRs, and H3 in particular is believed to play a unique role in conferring fine specificity to antibodies. See, e.g., Xu et al.
  • the HVRs that are Kabat complementarity-determining regions are based on sequence variability and are the most commonly used (Kabat et al., Sequences of Proteins of Immunological Interest, 5 th Ed. Public Health Service, National Institute of Health, Bethesda, MD (1991)). Chothia HVRs refer instead to the location of the structural loops (Chothia and Lesk J. Mol. Biol.196:901-917 (1987)).
  • the “contact” HVRs are based on an analysis of the available complex crystal structures. The residues from each of these HVRs are noted below.
  • variable-domain residues HVR residues and framework region residues
  • Framework or “FR” residues are those variable-domain residues other than the HVR residues as herein defined.
  • variable-domain residue-numbering as in Kabat or “amino-acid- position numbering as in Kabat,” and variations thereof, refers to the numbering system used for heavy-chain variable domains or light-chain variable domains of the compilation of antibodies in Kabat et al., supra.
  • a heavy-chain variable domain may include a single amino acid insert (residue 52a according to Kabat) after residue 52 of H2 and inserted residues (e.g. residues 82a, 82b, and 82c, etc. according to Kabat) after heavy-chain FR residue 82.
  • the Kabat numbering of residues may be determined for a given antibody by alignment at regions of homology of the sequence of the antibody with a “standard” Kabat numbered sequence.
  • an “acceptor human framework” for the purposes herein is a framework comprising the amino acid sequence of a VL or VH framework derived from a human immunoglobulin framework or a human consensus framework.
  • An acceptor human framework “derived from” a human immunoglobulin framework or a human consensus framework may comprise the same amino acid sequence thereof, or it may contain pre-existing amino acid sequence changes. In some embodiments, the number of pre-existing amino acid changes are 10 or less, 9 or less, 8 or less, 7 or less, 6 or less, 5 or less, 4 or less, 3 or less, or 2 or less.
  • Percent (%) amino acid sequence identity with respect to a reference polypeptide sequence is defined as the percentage of amino acid residues in a candidate sequence that are identical with the amino acid residues in the reference polypeptide sequence, after aligning the sequences and introducing gaps, if necessary, to achieve the maximum percent sequence identity, and not considering any conservative substitutions as part of the sequence identity. Alignment for purposes of determining percent amino acid sequence identity can be achieved in various ways that are within the skill in the art, for instance, using publicly available computer software such as BLAST, BLAST-2, ALIGN or Megalign (DNASTAR) software. Those skilled in the art can determine appropriate parameters for aligning sequences, including any algorithms needed to achieve maximal alignment over the full length of the sequences being compared.
  • the % amino acid sequence identity of a given amino acid sequence A to, with, or against a given amino acid sequence B is calculated as follows: 100 times the fraction X/Y where X is the number of amino acid residues scored as identical matches by the sequence in that program's alignment of A and B, and where Y is the total number of amino acid residues in B. It will be appreciated that where the length of amino acid sequence A is not equal to the length of amino acid sequence B, the % amino acid sequence identity of A to B will not equal the % amino acid sequence identity of B to A.
  • an antibody that “binds to”, “specifically binds to” or is “specific for” a particular a polypeptide or an epitope on a particular polypeptide is one that binds to that particular polypeptide or epitope on a particular polypeptide without substantially binding to any other polypeptide or polypeptide epitope.
  • binding of an anti-Siglec-8 antibody described herein e.g., an antibody that binds to human Siglec-8) to an unrelated non-Siglec-8 polypeptide is less than about 10% of the antibody binding to Siglec-8 as measured by methods known in the art (e.g., enzyme-linked immunosorbent assay (ELISA)).
  • an antibody that binds to a Siglec-8 has a dissociation constant (Kd) of ⁇ 1 ⁇ M, ⁇ 100 nM, ⁇ 10 nM, ⁇ 2 nM, ⁇ 1 nM, ⁇ 0.7 nM, ⁇ 0.6 nM, ⁇ 0.5 nM, ⁇ 0.1 nM, ⁇ 0.01 nM, or ⁇ 0.001 nM (e.g.10 -8 M or less, e.g. from 10 -8 M to 10 -13 M, e.g., from 10 -9 M to 10 -13 M).
  • Kd dissociation constant
  • anti-Siglec-8 antibody or “an antibody that binds to human Siglec-8” refers to an antibody that binds to a polypeptide or an epitope of human Siglec-8 without substantially binding to any other polypeptide or epitope of an unrelated non-Siglec-8 polypeptide.
  • Siglec-8 refers to a human Siglec-8 protein. The term also includes naturally occurring variants of Siglec-8, including splice variants or allelic variants.
  • the amino acid sequence of an exemplary human Siglec-8 is shown in SEQ ID NO:72.
  • the amino acid sequence of another exemplary human Siglec-8 is shown in SEQ ID NO:73.
  • a human Siglec-8 protein comprises the human Siglec-8 extracellular domain fused to an immunoglobulin Fc region.
  • the amino acid sequence of an exemplary human Siglec- 8 extracellular domain fused to an immunoglobulin Fc region is shown in SEQ ID NO:74.
  • the amino acid sequence underlined in SEQ ID NO:74 indicates the Fc region of the Siglec-8 Fc fusion protein amino acid sequence.
  • Antibodies that “induce apoptosis” or are “apoptotic” are those that induce programmed cell death as determined by standard apoptosis assays, such as binding of annexin V, fragmentation of DNA, cell shrinkage, dilation of endoplasmic reticulum, cell fragmentation, and/or formation of membrane vesicles (called apoptotic bodies).
  • Antibody effector functions refer to those biological activities attributable to the Fc region (a native sequence Fc region or amino acid sequence variant Fc region) of an antibody, and vary with the antibody isotype. Examples of antibody effector functions include: C1q binding and complement dependent cytotoxicity; Fc receptor binding; antibody-dependent cell- mediated cytotoxicity (ADCC); phagocytosis; down regulation of cell surface receptors (e.g., B cell receptors); and B cell activation.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • FcRs Fc receptors
  • cytotoxic cells e.g., natural killer (NK) cells, neutrophils and macrophages
  • NK cells natural killer cells
  • monocytes express FcJRI, FcJRII and FcJRIII.
  • an anti-Siglec-8 antibody e.g., an antibody that binds to human Siglec-8 described herein enhances ADCC.
  • an in vitro ADCC assay such as that described in U.S. Pat. No.5,500,362 or 5,821,337 may be performed.
  • Useful effector cells for such assays include peripheral blood mononuclear cells (PBMC) and natural killer (NK) cells.
  • ADCC activity of the molecule of interest may be assessed in vivo, e.g., in an animal model such as that disclosed in Clynes et al., PNAS USA 95:652-656 (1998).
  • Other Fc variants that alter ADCC activity and other antibody properties include those disclosed by Ghetie et al., Nat Biotech.15:637-40, 1997; Duncan et al, Nature 332:563-564, 1988; Lund et al., J.
  • Fc region herein is used to define a C-terminal region of an immunoglobulin heavy chain, including native-sequence Fc regions and variant Fc regions.
  • the human IgG heavy-chain Fc region is usually defined to stretch from an amino acid residue at position Cys226, or from Pro230, to the carboxyl-terminus thereof.
  • Suitable native-sequence Fc regions for use in the antibodies of the present disclosure include human IgG1, IgG2, IgG3 and IgG4.
  • a single amino acid substitution (S228P according to Kabat numbering; designated IgG4Pro) may be introduced to abolish the heterogeneity observed in recombinant IgG4 antibody. See Angal, S. et al. (1993) Mol Immunol 30, 105–108.
  • Non-fucosylated or “fucose-deficient” antibody refers to a glycosylation antibody variant comprising an Fc region wherein a carbohydrate structure attached to the Fc region has reduced fucose or lacks fucose.
  • an antibody with reduced fucose or lacking fucose has improved ADCC function.
  • Non-fucosylated or fucose-deficient antibodies have reduced fucose relative to the amount of fucose on the same antibody produced in a cell line.
  • a non-fucosylated or fucose-deficient antibody composition contemplated herein is a composition wherein less than about 50% of the N-linked glycans attached to the Fc region of the antibodies in the composition comprise fucose.
  • fucose refers to the presence of fucose residues within the oligosaccharides attached to the peptide backbone of an antibody.
  • a fucosylated antibody comprises ⁇ (l,6)-linked fucose at the innermost N-acetylglucosamine (GlcNAc) residue in one or both of the N-linked oligosaccharides attached to the antibody Fc region, e.g. at position Asn 297 of the human IgG1 Fc domain (EU numbering of Fc region residues). Asn297 may also be located about + 3 amino acids upstream or downstream of position 297, i.e. between positions 294 and 300, due to minor sequence variations in immunoglobulins.
  • GlcNAc N-acetylglucosamine
  • the "degree of fucosylation” is the percentage of fucosylated oligosaccharides relative to all oligosaccharides identified by methods known in the art e.g., in an N-glycosidase F treated antibody composition assessed by matrix-assisted laser desorption-ionization time-of-flight mass spectrometry (MALDI-TOF MS).
  • a composition of a "fully fucosylated antibody” essentially all oligosaccharides comprise fucose residues, i.e. are fucosylated.
  • a composition of a fully fucosylated antibody has a degree of fucosylation of at least about 90%.
  • an individual antibody in such a composition typically comprises fucose residues in each of the two N-linked oligosaccharides in the Fc region.
  • a composition of a "fully non-fucosylated” antibody essentially none of the oligosaccharides are fucosylated, and an individual antibody in such a composition does not contain fucose residues in either of the two N-linked oligosaccharides in the Fc region.
  • a composition of a fully non- fucosylated antibody has a degree of fucosylation of less than about 10%.
  • a composition of a "partially fucosylated antibody" only part of the oligosaccharides comprise fucose.
  • an individual antibody in such a composition can comprise fucose residues in none, one or both of the N- linked oligosaccharides in the Fc region, provided that the composition does not comprise essentially all individual antibodies that lack fucose residues in the N-linked oligosaccharides in the Fc region, nor essentially all individual antibodies that contain fucose residues in both of the N- linked oligosaccharides in the Fc region.
  • a composition of a partially fucosylated antibody has a degree of fucosylation of about 10% to about 80% (e.g., about 50% to about 80%, about 60% to about 80%, or about 70% to about 80%).
  • Binding affinity refers to the strength of the non-covalent interactions between a single binding site of a molecule (e.g., an antibody) and its binding partner (e.g., an antigen).
  • a binding affinity of an antibody for a Siglec-8 (which may be a dimer, such as the Siglec-8-Fc fusion protein described herein) can generally be represented by a dissociation constant (Kd). Affinity can be measured by common methods known in the art, including those described herein.
  • Binding avidity refers to the binding strength of multiple binding sites of a molecule (e.g., an antibody) and its binding partner (e.g., an antigen).
  • An “isolated” nucleic acid molecule encoding the antibodies herein is a nucleic acid molecule that is identified and separated from at least one contaminant nucleic acid molecule with which it is ordinarily associated in the environment in which it was produced. In some embodiments, the isolated nucleic acid is free of association with all components associated with the production environment.
  • the isolated nucleic acid molecules encoding the polypeptides and antibodies herein is in a form other than in the form or setting in which it is found in nature.
  • Isolated nucleic acid molecules therefore are distinguished from nucleic acid encoding the polypeptides and antibodies herein existing naturally in cells.
  • pharmaceutical formulation refers to a preparation that is in such form as to permit the biological activity of the active ingredient to be effective, and that contains no additional components that are unacceptably toxic to an individual to which the formulation would be administered. Such formulations are sterile.
  • Carriers as used herein include pharmaceutically acceptable carriers, excipients, or stabilizers that are nontoxic to the cell or mammal being exposed thereto at the dosages and concentrations employed. Often the physiologically acceptable carrier is an aqueous pH buffered solution.
  • physiologically acceptable carriers include buffers such as phosphate, citrate, and other organic acids; antioxidants including ascorbic acid; low molecular weight (less than about 10 residues) polypeptide; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, arginine or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugar alcohols such as mannitol or sorbitol; salt-forming counterions such as sodium; and/or nonionic surfactants such as TWEENTM, polyethylene glycol (PEG), and PLURONICSTM.
  • buffers such as phosphate, citrate, and other organic acids
  • antioxidants including ascorbic acid
  • proteins such as serum albumin,
  • treatment refers to clinical intervention designed to alter the natural course of the individual or cell being treated during the course of clinical pathology. Desirable effects of treatment include decreasing the rate of disease progression, ameliorating or palliating the disease state, and remission or improved prognosis.
  • An individual is successfully “treated”, for example, if one or more symptoms associated with a disease (e.g., IBS and/or functional dyspepsia) are mitigated or eliminated.
  • an individual is successfully “treated” if treatment results in increasing the quality of life of those suffering from a disease, decreasing the dose of other medications required for treating the disease, reducing the frequency of recurrence of the disease, lessening severity of the disease, delaying the development or progression of the disease, and/or prolonging survival of individuals.
  • “in conjunction with” or “in combination with” refers to administration of one treatment modality in addition to another treatment modality. As such, “in conjunction with” or “in combination with” refers to administration of one treatment modality before, during or after administration of the other treatment modality to the individual.
  • prevention includes providing prophylaxis with respect to occurrence or recurrence of a disease in an individual.
  • An individual may be predisposed to a disease, susceptible to a disease, or at risk of developing a disease, but has not yet been diagnosed with the disease.
  • anti-Siglec-8 antibodies e.g., an antibody that binds to human Siglec-8 described herein are used to delay development of a disease (e.g., IBS and/or functional dyspepsia).
  • an individual “at risk” of developing a disease may or may not have detectable disease or symptoms of disease, and may or may not have displayed detectable disease or symptoms of disease prior to the treatment methods described herein.
  • At risk denotes that an individual has one or more risk factors, which are measurable parameters that correlate with development of the disease (e.g., IBS and/or functional dyspepsia), as known in the art. An individual having one or more of these risk factors has a higher probability of developing the disease than an individual without one or more of these risk factors.
  • an “effective amount” refers to at least an amount effective, at dosages and for periods of time necessary, to achieve the desired or indicated effect, including a therapeutic or prophylactic result.
  • An effective amount can be provided in one or more administrations.
  • a “therapeutically effective amount” is at least the minimum concentration required to effect a measurable improvement of a particular disease.
  • a therapeutically effective amount herein may vary according to factors such as the disease state, age, sex, and weight of the patient, and the ability of the antibody to elicit a desired response in the individual.
  • a therapeutically effective amount may also be one in which any toxic or detrimental effects of the antibody are outweighed by the therapeutically beneficial effects.
  • prophylactically effective amount refers to an amount effective, at the dosages and for periods of time necessary, to achieve the desired prophylactic result. Typically but not necessarily, since a prophylactic dose is used in individuals prior to or at the earlier stage of disease, the prophylactically effective amount can be less than the therapeutically effective amount.
  • “Chronic” administration refers to administration of the medicament(s) in a continuous as opposed to acute mode, so as to maintain the initial therapeutic effect (activity) for an extended period of time. “Intermittent” administration is treatment that is not consecutively done without interruption, but rather is cyclic in nature.
  • package insert is used to refer to instructions customarily included in commercial packages of therapeutic products, that contain information about the indications, usage, dosage, administration, combination therapy, contraindications and/or warnings concerning the use of such therapeutic products.
  • an “individual” or a “subject” is a mammal.
  • a “mammal” for purposes of treatment includes humans, domestic and farm animals, and zoo, sports, or pet animals, such as dogs, horses, rabbits, cattle, pigs, hamsters, gerbils, mice, ferrets, rats, cats, etc.
  • the individual or subject is a human. II.
  • Methods [0074] Provided herein are methods for treating and/or preventing IBS in an individual comprising administering to the individual an effective amount of an antibody described herein that binds to human Siglec-8 (e.g., an anti-Siglec-8 antibody) or compositions comprising said antibodies. Further provided herein are methods for treating and/or preventing functional dyspepsia in an individual comprising administering to the individual an effective amount of an antibody described herein that binds to human Siglec-8 (e.g., an anti-Siglec-8 antibody) or compositions comprising said antibodies.
  • the antibody is in a pharmaceutical composition comprising the antibody and a pharmaceutically acceptable carrier.
  • the individual is a human.
  • the individual has IBS. In some embodiments, the individual has been diagnosed with IBS. IBS is typically a diagnosis of exclusion. For example, in some embodiments, the individual has one or more symptoms of IBS as disclosed herein and optionally has been tested to rule out one or more other conditions. [0076] In some embodiments, prior to administration of the composition, the individual has failed or is not adequately controlled by one or more standard-of-care treatments for IBS. [0077] In some embodiments, the individual has functional dyspepsia. In some embodiments, the individual has been diagnosed with functional dyspepsia. Like IBS, functional dyspepsia is typically a diagnosis of exclusion.
  • the individual has one or more symptoms of functional dyspepsia as disclosed herein and optionally has been tested to rule out one or more other conditions, e.g., by endoscopy.
  • the individual is or has tested negative for H. pylori infection.
  • prior to administration of the composition the individual has failed or is not adequately controlled by one or more standard-of-care treatments for functional dyspepsia.
  • one or both of a number or activity of mast cells and/or eosinophils in a sample obtained from the gastric, duodenal, jejunal, ileal, or colonic mucosa of the individual are reduced after administration of the composition as compared to a baseline level before administration of the composition.
  • administering to an individual as described herein e.g., an individual having IBS and/or functional dyspepsia
  • an effective amount of a composition of the present disclosure or antibody described herein that binds to human Siglec-8 reduces one or more (e.g., one or more, two or more, three or more, four or more, etc.) symptoms in the individual, as compared to a baseline level before administration of the antibody.
  • one or more symptom(s) of IBS in the individual are reduced after administration of the composition as compared to a baseline level before administration of the composition.
  • Symptoms of IBS include, but are not limited to, one or more of abdominal pain, abdominal cramping, gas, nausea, bloating, diarrhea, constipation, tenesmus, urgency, fecal incontinence, and mucus in stool.
  • one or more symptom(s) of functional dyspepsia in the individual are reduced after administration of the composition as compared to a baseline level before administration of the composition.
  • Symptoms of functional dyspepsia include, but are not limited to, one or more of abdominal discomfort or burning sensation, bloating, post-prandial pain, belching, early feelings of satiety, vomiting, and nausea.
  • administration of a composition or anti-Siglec-8 antibody of the present disclosure results in a sustained response to treatment. In some embodiments, administration of a composition or antibody of the present disclosure results in a complete response to treatment (e.g., after cessation of treatment, or after a single dose of the antibody or composition).
  • baseline or “baseline value” used interchangeably herein can refer to a measurement or characterization of a symptom before the administration of the therapy (e.g., an anti-Siglec-8 antibody) or at the beginning of administration of the therapy.
  • the baseline value can be compared to a reference value in order to determine the reduction or improvement of a symptom of IBS and/or functional dyspepsia contemplated herein.
  • a reference value and/or baseline value can be obtained from one individual, from two different individuals or from a group of individuals (e.g., a group of two, three, four, five or more individuals).
  • the terms “reference” or “reference value” used interchangeably herein can refer to a measurement or characterization of a value or symptom in an individual without IBS or functional dyspepsia (or in a group of such individuals).
  • a “reference value” can be an absolute value; a relative value; a value that has an upper and/or lower limit; a range of values; an average value; a median value; a mean value; or a value as compared to a baseline value.
  • a “baseline value” can be an absolute value; a relative value; a value that has an upper and/or lower limit; a range of values; an average value; a median value; a mean value; or a value as compared to a reference value.
  • a reference value can be obtained from one individual, from two different individuals or from a group of individuals (e.g., a group of two, three, four, five or more individuals).
  • a reference value refers to a standard or benchmark value in the field. In some embodiments, a reference value refers to a value calculated de novo from one or more individuals (e.g., without IBS or functional dyspepsia).
  • Administration [0086] For the prevention or treatment of disease, the appropriate dosage of an active agent, will depend on the type of disease to be treated, as defined above, the severity and course of the disease, whether the agent is administered for preventive or therapeutic purposes, previous therapy, the individual's clinical history and response to the agent, and the discretion of the attending physician. The agent is suitably administered to the individual at one time or over a series of treatments.
  • an interval between administrations of an anti- Siglec-8 antibody (e.g., an antibody that binds to human Siglec-8) described herein is about one month or longer. In some embodiments, the interval between administrations is about 1 month, about two months, about three months, about four months, about five months, about six months or longer. As used herein, an interval between administrations refers to the time period between one administration of the antibody and the next administration of the antibody. As used herein, an interval of about one month includes four weeks.
  • the interval between administrations is about four weeks, about five weeks, about six weeks, about seven weeks, about eight weeks, about nine weeks, about ten weeks, about eleven weeks, about twelve weeks, about sixteen weeks, about twenty weeks, about twenty four weeks, or longer.
  • the treatment includes multiple administrations of the antibody, wherein the interval between administrations may vary.
  • the interval between the first administration and the second administration is about one month, and the intervals between the subsequent administrations are about three months.
  • the interval between the first administration and the second administration is about one month
  • the interval between the second administration and the third administration is about two months
  • the intervals between the subsequent administrations are about three months.
  • an anti- Siglec-8 antibody described herein e.g., an antibody that binds to human Siglec-8) is administered at a flat dose.
  • an anti-Siglec-8 antibody described herein e.g., an antibody that binds to human Siglec-8) is administered to an individual at a dosage from about 0.1 mg to about 1800 mg per dose.
  • the anti-Siglec-8 antibody (e.g., an antibody that binds to human Siglec-8) is administered to an individual at a dosage of about any of 0.1 mg, 0.5 mg, 1 mg, 5 mg , 10 mg, 20 mg, 30 mg, 40 mg, 50 mg, 60 mg, 70 mg, 80 mg, 90 mg, 100 mg, 150 mg, 200 mg, 250 mg, 300 mg, 350 mg, 400 mg, 450 mg, 500 mg, 550 mg, 600 mg, 650 mg, 700 mg, 750 mg, 800 mg, 850 mg, 900 mg, 950 mg, 1000 mg, 1100 mg, 1200 mg, 1300 mg, 1400 mg, 1500 mg, 1600 mg, 1700 mg, and 1800 mg per dose.
  • 0.1 mg 0.5 mg, 1 mg, 5 mg , 10 mg, 20 mg, 30 mg, 40 mg, 50 mg, 60 mg, 70 mg, 80 mg, 90 mg, 100 mg, 150 mg, 200 mg, 250 mg, 300 mg, 350 mg, 400 mg, 450 mg, 500 mg, 550 mg, 600
  • an anti-Siglec-8 antibody described herein is administered to an individual at a dosage from about 150 mg to about 450 mg per dose. In some embodiments, the anti-Siglec-8 antibody (e.g., an antibody that binds to human Siglec-8) is administered to an individual at a dosage of about any of 150 mg, 200 mg, 250 mg, 300 mg, 350 mg, 400 mg, and 450 mg per dose. In some embodiments, an anti-Siglec-8 antibody described herein (e.g., an antibody that binds to human Siglec-8) is administered to an individual at a dosage from about 0.1 mg/kg to about 20 mg/kg per dose.
  • an anti- Siglec-8 antibody described herein e.g., an antibody that binds to human Siglec-8) is administered to an individual at a dosage from about 0.01 mg/kg to about 10 mg/kg per dose.
  • an anti-Siglec-8 antibody described herein e.g., an antibody that binds to human Siglec-8 is administered to an individual at a dosage from about 0.1 mg/kg to about 10 mg/kg, about 1.0 mg/kg to about 10 mg/kg, or about 0.3mg/kg to about 1.0 mg/kg.
  • an anti-Siglec-8 antibody described herein is administered to an individual at a dosage of about any of 0.1 mg/kg, 0.3mg/kg, 0.4mg/kg, 0.5 mg/kg, 0.6mg/kg, 0.7mg/kg, 0.8mg/kg, 0.9mg/kg, 1.0 mg/kg, 1.5 mg/kg, 2.0 mg/kg, 2.5 mg/kg, 3.0 mg/kg, 3.5 mg/kg, 4.0 mg/kg, 4.5 mg/kg, 5.0 mg/kg, 5.5 mg/kg, 6.0 mg/kg, 6.5 mg/kg, 7.0 mg/kg, 7.5 mg/kg, 8.0 mg/kg, 8.5 mg/kg, 9.0 mg/kg, 9.5 mg/kg, or 10.0 mg/kg.
  • any of the dosing frequency described above may be used. Any dosing frequency described above may be used in the methods or uses of the compositions described herein.
  • Efficacy of treatment with an antibody described herein can be assessed using any of the methodologies or assays described herein at intervals ranging between every week and every three months. In some embodiments, efficacy of treatment (e.g., reduction or improvement of one or more symptoms) is assessed about every one month, about every two months, about every three months, about every four months, about every five months, about every six months or longer after administration of an antibody that binds to human Siglec-8.
  • efficacy of treatment is assessed about every one week, about every two weeks, about every three weeks, about every four weeks, about every five weeks, about every six weeks, about every seven weeks, about every eight weeks, about every nine weeks, about every ten weeks, about every eleven weeks, about every twelve weeks, about every sixteen weeks, about every twenty weeks, about every twenty four weeks, or longer.
  • an anti-Siglec-8 antibody described herein e.g., an antibody that binds to human Siglec-8) is administered to an individual (e.g., by intravenous infusion) at one or more doses comprising between about 0.1 mg/kg and about 4.0 mg/kg of the antibody.
  • the antibody is administered to an individual by intravenous infusion at one or more doses comprising between about 0.3 mg/kg and about 3.0 mg/kg of the antibody, e.g., at about 0.3 mg/kg antibody, about 0.5 mg/kg antibody, about 1.0 mg/kg antibody, about 1.5 mg/kg antibody, about 2.0 mg/kg antibody, about 2.5 mg/kg antibody, or about 3.0 mg/kg antibody.
  • the antibody is administered to the individual (e.g., by intravenous infusion) in two or more doses (e.g., comprising between about 0.3 mg/kg and about 3.0 mg/kg of the antibody) at an interval of about 28 days.
  • the antibody is administered to the individual (e.g., by intravenous infusion) monthly in two or more doses (e.g., comprising between about 0.3 mg/kg and about 3.0 mg/kg of the antibody). In some embodiments, the antibody is administered to the individual (e.g., by intravenous infusion) in two or more doses (e.g., comprising between about 0.3 mg/kg and about 3.0 mg/kg of the antibody) at an interval of about 4 weeks. In some embodiments, the antibody is administered to the individual (e.g., by intravenous infusion) according to the following schedule: Day 1, Day 29, Day 57, Day 85, Day 113, and Day 141.
  • the antibody is administered to the individual by intravenous infusion at a first dose comprising about 0.3 mg/kg of the antibody, a second dose comprising about 1.0 mg/kg of the antibody, a third dose comprising about 1.0 mg/kg of the antibody, a fourth dose comprising about 1.0 mg/kg to about 3.0 mg/kg of the antibody, a fifth dose comprising about 1.0 mg/kg to about 3.0 mg/kg of the antibody, and a sixth dose comprising about 1.0 mg/kg to about 3.0 mg/kg of the antibody.
  • the antibody is administered to the individual by intravenous infusion at a first dose comprising about 0.3 mg/kg of the antibody, a second dose comprising about 1.0 mg/kg of the antibody, a third dose comprising about 1.0 mg/kg of the antibody, a fourth dose comprising about 1.0 mg/kg or about 3.0 mg/kg of the antibody, a fifth dose comprising about 1.0 mg/kg or about 3.0 mg/kg of the antibody, and a sixth dose comprising about 1.0 mg/kg or about 3.0 mg/kg of the antibody.
  • the antibody is administered to the individual by intravenous infusion at a first dose comprising about 0.3 mg/kg of the antibody, a second dose comprising about 1.0 mg/kg of the antibody, a third dose comprising about 1.0 mg/kg of the antibody, a fourth dose comprising about 1.0 mg/kg of the antibody, a fifth dose comprising about 1.0 mg/kg of the antibody, and a sixth dose comprising about 1.0 mg/kg of the antibody.
  • the antibody is administered to the individual by intravenous infusion according to the following schedule: about 0.3 mg/kg of the antibody on Day 1, about 1.0 mg/kg of the antibody on Day 29, about 1.0 mg/kg of the antibody on Day 57, about 1.0 mg/kg or about 3.0 mg/kg of the antibody on Day 85, about 1.0 mg/kg or about 3.0 mg/kg of the antibody on Day 113, and about 1.0 mg/kg or about 3.0 mg/kg of the antibody on Day 141.
  • the methods of the present disclosure comprise administering an anti-Siglec-8 antibody or composition of the present disclosure in one or more doses.
  • a corticosteroid is administered to the individual at least 6 hours prior to administration of the first dose of the composition (i.e., comprising an antibody that binds to human Siglec-8).
  • the methods comprise administering a corticosteroid to the individual, then administering to the individual a first dose of the composition (i.e., comprising an antibody that binds to human Siglec-8) at least 6 hours after administering the corticosteroid.
  • the corticosteroid is administered to the individual at least 12 hours prior to administration of the composition.
  • the corticosteroid is administered to the individual within 24 hours prior to administration of the composition, e.g., 6- 24 hours prior, or 12-24 hours prior.
  • the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours.
  • a corticosteroid is administered to the individual at least 6 hours prior to administration of the first dose of the composition (i.e., comprising an antibody that binds to human Siglec-8).
  • the methods comprise administering a corticosteroid to the individual, then administering to the individual a first dose of the composition (i.e., comprising an antibody that binds to human Siglec-8) at least 6 hours after administering the corticosteroid, wherein the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours.
  • the corticosteroid is prednisone. In some embodiments, the corticosteroid is methylprednisolone, hydrocortisone, or dexamethasone. In some embodiments, the corticosteroid is prednisone, cortisone, dexamethasone, hydrocortisone, methylprednisolone, or prednisolone. In some embodiments, the corticosteroid is self-administered by the individual being treated with the anti-Siglec-8 antibody. In some embodiments, the corticosteroid is administered orally.
  • the corticosteroid e.g., prednisone
  • the corticosteroid is administered at a dose of greater than 0.5mg/kg, or about 1mg/kg.
  • the corticosteroid e.g., prednisone
  • the methods comprise administering to the individual greater than 0.5mg/kg prednisone at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), 6-24 hours, or 12- 24 hours prior to administration of the first dose of the anti-Siglec-8 antibody.
  • the methods comprise administering to the individual 0.5mg/kg to 1mg/kg prednisone at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), 6-24 hours, or 12-24 hours prior to administration of the first dose of the anti- Siglec-8 antibody. In some embodiments, the methods comprise administering to the individual 1mg/kg prednisone at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), 6-24 hours, or 12-24 hours prior to administration of the first dose of the anti-Siglec-8 antibody.
  • the methods comprise administering to the individual 60mg or 80mg prednisone at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), 6-24 hours, or 12-24 hours prior to administration of the first dose of the anti-Siglec-8 antibody.
  • the first dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours. In some embodiments, less than 50% of total volume of the first dose is administered to the individual in the first 2 hours of the infusion. In some embodiments, less than 30% of total volume of the first dose is administered to the individual in the first 2 hours of the infusion.
  • the first dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 1 mL/hour for 15 minutes, 5 mL/hour for 15 minutes, 10 mL/hour for 30 minutes, 15 mL/hour for 30 minutes, 25 mL/hour for 30 minutes, 30 mL/hour for 30 minutes, 35 mL/hour for 30 minutes, and 40 mL/hour for 62 minutes.
  • the first dose is administered to the individual by intravenous infusion according to the schedule shown in Table A. Table A. Infusion rate schedule for 4-hour infusion.
  • administration of the first dose of the composition by intravenous infusion over a period of about 4 hours reduces the risk of infusion-related reaction (IRR) in the individual, as compared to administration of the first dose by intravenous infusion over a period that is less than about 4 hours. In some embodiments, administration of the first dose of the composition by intravenous infusion over a period of about 4 hours reduces the severity of infusion-related reaction (IRR) in the individual, as compared to administration of the first dose by intravenous infusion over a period that is less than about 4 hours.
  • the antibody that binds to human Siglec-8 is administered to the individual at between 0.1mg/kg and 10mg/kg in the first dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at between 1mg/kg and 10mg/kg in the first dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at between 0.1mg/kg and 3mg/kg in the first dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at between 0.1mg/kg and 1mg/kg in the first dose.
  • the antibody that binds to human Siglec-8 is administered to the individual at between about 1mg/kg and about 3mg/kg in the first dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg in the first dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 3mg/kg in the first dose.
  • the antibody that binds to human Siglec-8 is administered to the individual at about any of 0.1 mg/kg, 0.5 mg/kg, 1.0 mg/kg, 1.5 mg/kg, 2.0 mg/kg, 2.5 mg/kg, 3.0 mg/kg, 3.5 mg/kg, 4.0 mg/kg, 4.5 mg/kg, 5.0 mg/kg, 5.5 mg/kg, 6.0 mg/kg, 6.5 mg/kg, 7.0 mg/kg, 7.5 mg/kg, 8.0 mg/kg, 8.5 mg/kg, 9.0 mg/kg, 9.5 mg/kg, or 10.0 mg/kg in the first dose.
  • the antibody that binds to human Siglec-8 is administered to the individual in the first dose via the intravenous or subcutaneous route.
  • the methods further comprise administering a corticosteroid to the individual 1-2 hours prior to administration of the first dose. That is, the methods can comprise administering a corticosteroid at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), 6-24 hours, or 12-24 hours prior to administration of the first dose, as well as administering a corticosteroid within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the first dose.
  • the corticosteroid is prednisone.
  • the corticosteroid is methylprednisolone. In some embodiments, the corticosteroid is hydrocortisone or dexamethasone. In some embodiments, the corticosteroid is administered orally. In some embodiments, the corticosteroid is administered intravenously. In some embodiments, the corticosteroid (e.g., prednisone) is administered at a dose of greater than 0.5mg/kg within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the first dose.
  • the corticosteroid (e.g., prednisone) is administered at a dose of about 1mg/kg within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the first dose. In some embodiments, the corticosteroid (e.g., prednisone) is administered at a dose of 80mg within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the first dose. In some embodiments, the corticosteroid (e.g., methylprednisolone) is administered at a dose of 100mg within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the first dose.
  • the methods further comprise administering an antihistamine to the individual 1-2 hours prior to administration of the first dose.
  • the methods can comprise administering an antihistamine within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the first dose.
  • the antihistamine is cetirizine.
  • the antihistamine is administered orally.
  • the antihistamine e.g., cetirizine
  • the antihistamine e.g., cetirizine
  • the methods further comprise administering an antipyretic or non-steroidal anti-inflammatory drug (NSAID) to the individual 1-2 hours prior to administration of the first dose.
  • NSAID antipyretic or non-steroidal anti-inflammatory drug
  • the methods can comprise administering an antipyretic or NSAID within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the first dose.
  • the antipyretic or NSAID is acetaminophen.
  • the antipyretic or NSAID is administered orally.
  • the antipyretic or NSAID e.g., acetaminophen
  • the methods further comprise administering to the individual a second dose of a composition comprising an antibody that binds to human Siglec-8.
  • the second dose can be administered about 28 days, about 4 weeks, or about 1 month after administration of the first dose.
  • the second dose is administered to the individual without administration of a corticosteroid to the individual at least 6 hours, at least 12 hours, 6-24 hours, or 12-24 hours prior to administration of the second dose. That is, in some embodiments, corticosteroid is administered to the individual at least 6 hours, at least 12 hours, 6-24 hours, or 12-24 hours prior to administration of only the first dose, but not subsequent doses, of the anti- Siglec-8 antibody.
  • the second dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours. In some embodiments, less than 50% of total volume of the second dose is administered to the individual in the first 2 hours of the infusion.
  • the second dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 1 mL/hour for 15 minutes, 5 mL/hour for 15 minutes, 10 mL/hour for 30 minutes, 15 mL/hour for 30 minutes, 25 mL/hour for 30 minutes, 30 mL/hour for 30 minutes, 35 mL/hour for 30 minutes, and 40 mL/hour for 62 minutes.
  • the second dose is administered to the individual by intravenous infusion according to the schedule shown in Table A.
  • the first and the second doses are administered to the individual by intravenous infusion according to the schedule shown in Table A.
  • the antibody that binds to human Siglec-8 is administered to the individual at between 0.1mg/kg and 10mg/kg in the second dose (and optionally any subsequent doses).
  • the antibody that binds to human Siglec-8 is administered to the individual at between 1mg/kg and 10mg/kg in the second dose (and optionally any subsequent doses).
  • the antibody that binds to human Siglec-8 is administered to the individual at between 0.1mg/kg and 3mg/kg in the second dose (and optionally any subsequent doses).
  • the antibody that binds to human Siglec-8 is administered to the individual at between 0.1mg/kg and 1mg/kg in the second dose (and optionally any subsequent doses). In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at between about 1mg/kg and about 3mg/kg in the second dose (and optionally any subsequent doses). In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg in the second dose (and optionally any subsequent doses). In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 3mg/kg in the second dose (and optionally any subsequent doses).
  • the antibody that binds to human Siglec-8 is administered to the individual at about any of 0.1 mg/kg, 0.5 mg/kg, 1.0 mg/kg, 1.5 mg/kg, 2.0 mg/kg, 2.5 mg/kg, 3.0 mg/kg, 3.5 mg/kg, 4.0 mg/kg, 4.5 mg/kg, 5.0 mg/kg, 5.5 mg/kg, 6.0 mg/kg, 6.5 mg/kg, 7.0 mg/kg, 7.5 mg/kg, 8.0 mg/kg, 8.5 mg/kg, 9.0 mg/kg, 9.5 mg/kg, or 10.0 mg/kg in the second dose (and optionally any subsequent doses).
  • the antibody that binds to human Siglec-8 is administered to the individual at between about 0.1mg/kg and about 1mg/kg in the first dose and between about 3mg/kg and about 10mg/kg in the second dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at between about 1mg/kg and about 3mg/kg in the first dose and between about 1mg/kg and about 3mg/kg in the second dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg in the first dose and at 3mg/kg in the second dose.
  • the antibody that binds to human Siglec-8 is administered to the individual at 3mg/kg in the first dose and at 10mg/kg in the second dose. [0102] In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual in the second dose (and optionally any subsequent doses) via the intravenous or subcutaneous route. [0103] In some embodiments, the second dose is administered without administration of a corticosteroid at least 6 hours, at least 12 hours, within 24 hours, 6-24 hours, or 12-24 hours prior to administration of the second dose.
  • a corticosteroid is administered to the individual at least 6 hours, at least 12 hours, within 24 hours, 6-24 hours, or 12-24 hours prior to administration of the second dose.
  • the corticosteroid is prednisone.
  • the corticosteroid is methylprednisolone, hydrocortisone, or dexamethasone.
  • the corticosteroid is self-administered by the individual being treated with the anti-Siglec-8 antibody.
  • the corticosteroid is administered orally.
  • the corticosteroid e.g., prednisone
  • the corticosteroid is administered at a dose of greater than 0.5mg/kg, or about 1mg/kg.
  • the corticosteroid e.g., prednisone
  • the methods comprise administering to the individual greater than 0.5mg/kg prednisone at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), 6-24 hours, or 12-24 hours prior to administration of the second dose of the anti-Siglec-8 antibody.
  • the methods comprise administering to the individual 1mg/kg prednisone at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), 6-24 hours, or 12-24 hours prior to administration of the second dose of the anti-Siglec-8 antibody. In some embodiments, the methods comprise administering to the individual 80mg prednisone at least 6 hours (and optionally within 24 hours), at least 12 hours (and optionally within 24 hours), 6-24 hours, or 12-24 hours prior to administration of the second dose of the anti-Siglec-8 antibody.
  • administration of the corticosteroid at least 6 hours prior to administration of the second dose reduces the risk of infusion-related reaction (IRR) in the individual, as compared to administration of the second dose without administration of the corticosteroid at least 6 hours prior.
  • administration of the corticosteroid at least 12 hours prior to administration of the second dose reduces the risk of infusion-related reaction (IRR) in the individual, as compared to administration of the second dose without administration of the corticosteroid at least 12 hours prior.
  • administration of the corticosteroid 12-24 hours prior to administration of the second dose reduces the risk of infusion-related reaction (IRR) in the individual, as compared to administration of the second dose without administration of the corticosteroid 12-24 hours prior.
  • administration of the corticosteroid at least 6 hours prior to administration of the second dose reduces the severity of infusion-related reaction (IRR) in the individual, as compared to administration of the second dose without administration of the corticosteroid at least 6 hours prior.
  • administration of the corticosteroid at least 12 hours prior to administration of the second dose reduces the severity of infusion-related reaction (IRR) in the individual, as compared to administration of the second dose without administration of the corticosteroid at least 12 hours prior.
  • administration of the corticosteroid 12-24 hours prior to administration of the second dose reduces the severity of infusion-related reaction (IRR) in the individual, as compared to administration of the second dose without administration of the corticosteroid 12-24 hours prior.
  • a corticosteroid is administered to the individual at least 6 hours, at least 12 hours, within 24 hours, 6-24 hours, or 12-24 hours prior to administration of the first and second doses.
  • a corticosteroid is administered to the individual at least 6 hours, at least 12 hours, within 24 hours, 6-24 hours, or 12-24 hours prior to administration of the first and second doses, but not prior to any subsequent doses of the anti-Siglec-8 antibody.
  • the methods further comprise administering a corticosteroid to the individual 1-2 hours prior to administration of the second dose (and optionally any subsequent doses).
  • the corticosteroid administered to the individual 1-2 hours prior to administration of the first dose is methylprednisolone.
  • 100mg methylprednisolone is administered to the individual within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the first dose (e.g., intravenously).
  • the methods further comprise administering an antihistamine to the individual 1-2 hours prior to administration of the second dose (and optionally any subsequent doses).
  • the methods can comprise administering an antihistamine within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the second dose (and optionally any subsequent doses).
  • the antihistamine is cetirizine.
  • the antihistamine is administered orally.
  • the antihistamine e.g., cetirizine
  • the methods further comprise administering an antipyretic or non-steroidal anti-inflammatory drug (NSAID) to the individual 1-2 hours prior to administration of the second dose (and optionally any subsequent doses).
  • NSAID antipyretic or non-steroidal anti-inflammatory drug
  • the methods can comprise administering an antipyretic or NSAID within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the second dose (and optionally any subsequent doses).
  • the antipyretic or NSAID is acetaminophen. In some embodiments, the antipyretic or NSAID is administered orally. In some embodiments, the antipyretic or NSAID (e.g., acetaminophen) is administered at a dose of 975-1000mg within 1 hour, about 1 hour, within 2 hours, about 2 hours, or 1-2 hours prior to administration of the second dose (and optionally any subsequent doses). [0107] In some embodiments according to any of the embodiments described herein, the methods further comprise administering to the individual a third dose of a composition comprising an antibody that binds to human Siglec-8 (e.g., subsequent to administration of a second dose as described herein).
  • the third dose can be administered about 28 days, about 4 weeks, or about 1 month after administration of the second dose and/or about 56 days, about 8 weeks, or about 2 months after administration of the first dose.
  • the third dose is administered to the individual without administration of a corticosteroid to the individual at least 6 hours, at least 12 hours, 6-24 hours, or 12-24 hours prior to administration of the third dose.
  • the third dose of the composition is administered to the individual by intravenous infusion over a period of about 2 hours to about 4 hours.
  • the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 hour to about 4 hours.
  • the third dose of the composition is administered to the individual by intravenous infusion over a period of about 2 hours. In some embodiments, the third dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 10 mL/hour for 30 minutes, 25 mL/hour for 15 minutes, 40 mL/hour for 15 minutes, 55 mL/hour for 15 minutes, 70 mL/hour for 15 minutes, 85 mL/hour for 15 minutes, and 100 mL/hour for 16 minutes. In some embodiments, the third dose is administered to the individual by intravenous infusion according to the schedule shown in Table B. In some embodiments, the third dose of the composition is administered to the individual by intravenous infusion over a period of about 3 hours.
  • the third dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 2 mL/hour for 30 minutes, 10 mL/hour for 30 minutes, 20 mL/hour for 30 minutes, 40 mL/hour for 30 minutes, and 60 mL/hour for 64 minutes.
  • the third dose is administered to the individual by intravenous infusion according to the schedule shown in Table C.
  • the third dose of the composition is administered to the individual by intravenous infusion over a period of about 4 hours.
  • the third dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 1 mL/hour for 15 minutes, 5 mL/hour for 15 minutes, 10 mL/hour for 30 minutes, 15 mL/hour for 30 minutes, 25 mL/hour for 30 minutes, 30 mL/hour for 30 minutes, 35 mL/hour for 30 minutes, and 40 mL/hour for 62 minutes.
  • the third dose is administered to the individual by intravenous infusion according to the schedule shown in Table A.
  • the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 hour.
  • the third dose is administered to the individual by intravenous infusion according to the following schedule, in chronological order: 24 mL/hour for 15 minutes, and 125.3 mL/hour for 45 minutes.
  • the third dose is administered to the individual by intravenous infusion according to the schedule shown in Table D.
  • Table B Infusion rate schedule for 2-hour infusion.
  • Table C Infusion rate schedule for 3-hour infusion.
  • Table D Infusion rate schedule for 1-hour infusion.
  • the first and the second doses of the composition are administered to the individual by intravenous infusion over a period of about 4 hours
  • the third dose of the composition is administered to the individual by intravenous infusion over a period of about 1 hour to about 4 hours.
  • the first, second, and third doses are administered to the individual by intravenous infusion over a period of about 4 hours, e.g., according to Table A.
  • the first and second doses are administered to the individual by intravenous infusion over a period of about 4 hours, e.g., according to Table A
  • the third dose is administered to the individual by intravenous infusion over a period of about 3 hours, e.g., according to Table C.
  • the first and second doses are administered to the individual by intravenous infusion over a period of about 4 hours, e.g., according to Table A, and the third dose is administered to the individual by intravenous infusion over a period of about 2 hours, e.g., according to Table B.
  • the first and second doses are administered to the individual by intravenous infusion over a period of about 4 hours, e.g., according to Table A
  • the third dose is administered to the individual by intravenous infusion over a period of about 1 hour, e.g., according to Table D.
  • the third dose can be administered to the individual over a shorter infusion time, e.g., according to physician’s judgement, if no or mild infusion-related reaction(s) occur after administration of the first and/or second doses.
  • the antibody that binds to human Siglec-8 is administered to the individual at between 0.1mg/kg and 10mg/kg in the third dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at between 1mg/kg and 10mg/kg in the third dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 3mg/kg in the third dose.
  • the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg in the third dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg in the first dose, followed by 3mg/kg in the second and third doses. [0111] In some embodiments according to any of the embodiments described herein, the methods further comprise administering to the individual a fourth dose of a composition comprising an antibody that binds to human Siglec-8 (e.g., subsequent to administration of a third dose as described herein).
  • the fourth dose can be administered about 28 days, about 4 weeks, or about 1 month after administration of the third dose; about 56 days, about 8 weeks, or about 2 months after administration of the second dose; and/or about 84 days, about 12 weeks, or about 3 months after administration of the first dose.
  • the fourth dose is administered to the individual without administration of a corticosteroid to the individual at least 6 hours, at least 12 hours, 6-24 hours, or 12-24 hours prior to administration of the third dose.
  • six doses or more of a composition comprising an antibody that binds to human Siglec-8 are administered to the individual (e.g., administered every 28 days, every 4 weeks, or every month).
  • the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion over a period of about 2 hours to about 4 hours. In some embodiments, the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion over a period of about 1 hour to about 4 hours. In some embodiments, the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion over a period of about 2 hours.
  • the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion according to the following schedule, in chronological order: 10 mL/hour for 30 minutes, 25 mL/hour for 15 minutes, 40 mL/hour for 15 minutes, 55 mL/hour for 15 minutes, 70 mL/hour for 15 minutes, 85 mL/hour for 15 minutes, and 100 mL/hour for 16 minutes.
  • the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion according to the schedule shown in Table B.
  • the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion over a period of about 3 hours.
  • the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion according to the following schedule, in chronological order: 2 mL/hour for 30 minutes, 10 mL/hour for 30 minutes, 20 mL/hour for 30 minutes, 40 mL/hour for 30 minutes, and 60 mL/hour for 64 minutes.
  • the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion according to the schedule shown in Table C.
  • the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion over a period of about 4 hours.
  • the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion according to the following schedule, in chronological order: 1 mL/hour for 15 minutes, 5 mL/hour for 15 minutes, 10 mL/hour for 30 minutes, 15 mL/hour for 30 minutes, 25 mL/hour for 30 minutes, 30 mL/hour for 30 minutes, 35 mL/hour for 30 minutes, and 40 mL/hour for 62 minutes.
  • the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion according to the schedule shown in Table A.
  • the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion over a period of about 1 hour. In some embodiments, the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion according to the following schedule, in chronological order: 24 mL/hour for 15 minutes, and 125.3 mL/hour for 45 minutes. In some embodiments, the fourth and/or subsequent dose(s) of the composition are administered to the individual by intravenous infusion according to the schedule shown in Table D.
  • the first and the second doses of the composition are administered to the individual by intravenous infusion over a period of about 4 hours
  • the third and fourth doses of the composition are administered to the individual by intravenous infusion over a period of about 1 hour to about 4 hours.
  • the first, second, third, and fourth doses are administered to the individual by intravenous infusion over a period of about 4 hours, e.g., according to Table A.
  • the first and second doses are administered to the individual by intravenous infusion over a period of about 4 hours, e.g., according to Table A, and the third and/or fourth doses are administered to the individual by intravenous infusion over a period of about 3 hours, e.g., according to Table C.
  • the first and second doses are administered to the individual by intravenous infusion over a period of about 4 hours, e.g., according to Table A
  • the third and/or fourth doses are administered to the individual by intravenous infusion over a period of about 2 hours, e.g., according to Table B.
  • the first and second doses are administered to the individual by intravenous infusion over a period of about 4 hours, e.g., according to Table A, and the third and/or fourth doses are administered to the individual by intravenous infusion over a period of about 1 hour, e.g., according to Table D.
  • the first and second doses are administered to the individual by intravenous infusion over a period of about 4 hours (e.g., according to Table A), followed by 4 subsequent doses (e.g., administered every 28 days, every 4 weeks, or every month) administered to the individual by intravenous infusion over a period of about 1 hour to about 4 hours (e.g., according to Table B, C, or D).
  • the third, fourth, and/or subsequent dose(s) can be administered to the individual over a shorter infusion time, e.g., according to physician’s judgement, if no or mild infusion-related reaction(s) occur after administration of the first and/or second third doses.
  • the antibody that binds to human Siglec-8 is administered to the individual at between 0.1mg/kg and 10mg/kg in the fourth dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at between 1mg/kg and 10mg/kg in the fourth dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 3mg/kg in the fourth dose.
  • the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg in the fourth dose. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg in the first dose, followed by 3mg/kg in the second, third, and fourth doses. In some embodiments, the antibody that binds to human Siglec-8 is administered to the individual at 1mg/kg in the first dose, followed by 3mg/kg for 5 subsequent doses (e.g., administered every 28 days, every 4 weeks, or every month). [0115] Antibodies described herein that bind to human Siglec-8 can be used either alone or in combination with other agents in the methods described herein.
  • Such combination therapies noted above encompass combined administration (where two or more therapeutic agents are included in the same or separate formulations), and separate administration, in which case, administration of the antibody of the present disclosure can occur prior to, simultaneously, and/or following, administration of the one or more additional therapeutic agents.
  • administration of an anti-Siglec-8 antibody described herein and administration of one or more additional therapeutic agents occur within about one month, about two months, about three months, about four months, about five months or about six months of each other.
  • administration of an anti-Siglec-8 antibody described herein and administration of one or more additional therapeutic agents occur within about one week, about two weeks or about three weeks of each other.
  • administration of an anti- Siglec-8 antibody described herein and administration of one or more additional therapeutic agents occur within about one day, about two days, about three days, about four days, about five days, or about six days of each other.
  • Such combination therapies noted above encompass combined administration (where two or more therapeutic agents are included in the same or separate formulations), and separate administration, in which case, administration of the antibody of the present disclosure can occur prior to, simultaneously, and/or following, administration of the one or more additional therapeutic agents.
  • administration of an anti-Siglec-8 antibody described herein and administration of one or more additional therapeutic agents occur within about one month, about two months, about three months, about four months, about five months or about six months of each other.
  • administration of an anti-Siglec-8 antibody described herein and administration of one or more additional therapeutic agents occur within about one week, about two weeks or about three weeks of each other. In some embodiments, administration of an anti-Siglec-8 antibody described herein and administration of one or more additional therapeutic agents occur within about one day, about two days, about three days, about four days, about five days, or about six days of each other.
  • Anti-Siglec8 antibodies and/or one or more additional therapeutic agents may be administered via any suitable route of administration known in the art, including, without limitation, by oral administration, sublingual administration, buccal administration, topical administration, rectal administration, via inhalation, transdermal administration, subcutaneous injection, intradermal injection, intravenous (IV) injection, intra-arterial injection, intramuscular injection, intracardiac injection, intraosseous injection, intraperitoneal injection, transmucosal administration, vaginal administration, intravitreal administration, intra-articular administration, peri-articular administration, local administration, epicutaneous administration, or any combinations thereof.
  • IV intravenous
  • IV intra-arterial injection
  • intramuscular injection intracardiac injection
  • intraosseous injection intraperitoneal injection
  • transmucosal administration vaginal administration
  • intravitreal administration intra-articular administration
  • peri-articular administration local administration
  • epicutaneous administration or any combinations thereof.
  • an anti-Siglec-8 antibody described herein has one or more of the following characteristics: (1) binds a human Siglec-8; (2) binds to an extracellular domain of a human Siglec-8; (3) binds a human Siglec-8 with a higher affinity than mouse antibody 2E2 and/or mouse antibody 2C4; (4) binds a human Siglec-8 with a higher avidity than mouse antibody 2E2 and/or mouse antibody 2C4; (5) has a T m of about 70oC-72oC or higher in a thermal shift assay; (6) has a reduced degree of fucosylation or is non-fucosylated; (7) binds a human Siglec-8 expressed on eosinophils and induces apoptosis of eosinophils;
  • the present disclosure provides antibodies that bind to a human Siglec-8.
  • the human Siglec-8 comprises an amino acid sequence of SEQ ID NO:72.
  • the human Siglec-8 comprises an amino acid sequence of SEQ ID NO:73.
  • an antibody described herein binds to a human Siglec-8 expressed on mast cells and depletes or reduces the number of mast cells.
  • an antibody described herein binds to a human Siglec-8 expressed on mast cells and inhibits mast cell-mediated activity.
  • the invention provides antibodies that bind to a human Siglec-8.
  • the human Siglec-8 comprises an amino acid sequence of SEQ ID NO:72.
  • the human Siglec-8 comprises an amino acid sequence of SEQ ID NO:73.
  • the antibody described herein binds to an epitope in Domain 1 of human Siglec-8, wherein Domain 1 comprises the amino acid sequence of SEQ ID NO: 112.
  • the antibody described herein binds to an epitope in Domain 2 of human Siglec-8, wherein Domain 2 comprises the amino acid sequence of SEQ ID NO: 113.
  • the antibody described herein binds to an epitope in Domain 3 of human Siglec-8, wherein Domain 3 comprises the amino acid sequence of SEQ ID NO: 114. In some embodiments, the antibody described herein binds to a fusion protein comprising the amino acid of SEQ ID NO:116 but not to a fusion protein comprising the amino acid of SEQ ID NO:115. In some embodiments, the antibody described herein binds to a fusion protein comprising the amino acid of SEQ ID NO:117 but not to a fusion protein comprising the amino acid of SEQ ID NO:115.
  • the antibody described herein binds to a fusion protein comprising the amino acid of SEQ ID NO:117 but not to a fusion protein comprising the amino acid of SEQ ID NO:116. In some embodiments, the antibody described herein binds to a linear epitope in the extracellular domain of human Siglec-8. In some embodiments, the antibody described herein binds to a conformational epitope in the extracellular domain of human Siglec- 8. In some embodiments, an antibody described herein binds to a human Siglec-8 expressed on eosinophils and induces apoptosis of eosinophils.
  • an antibody described herein binds to a human Siglec-8 expressed on mast cells and depletes mast cells. In some embodiments, an antibody described herein binds to a human Siglec-8 expressed on mast cells and inhibits mast cell-mediated activity. In some embodiments, an antibody described herein binds to a human Siglec-8 expressed on mast cells and kills mast cells by ADCC activity. In some embodiments, an antibody described herein depletes mast cells and inhibits mast cell activation. In some embodiments, an antibody herein depletes activated eosinophils and inhibits mast cell activation.
  • an antibody herein depletes blood eosinophils and inhibits mast cell activation.
  • an antibody herein depletes eosinophils from the peripheral blood and inhibits mast cell activation.
  • an antibody herein e.g., a non-fucosylated anti-Siglec-8 antibody
  • the invention provides antibodies that bind to a non-human primate Siglec-8. In one aspect, the invention provides antibodies that bind to a human Siglec-8 and a non-human primate Siglec-8. In some embodiments, the non-human primate Siglec-8 comprises an amino acid sequence of SEQ ID NO:118 or a portion thereof. In some embodiments, the non-human primate Siglec-8 comprises an amino acid sequence of SEQ ID NO:119 or a portion thereof. In some embodiments, the non-human primate is a baboon (e.g., Papio Anubis).
  • a baboon e.g., Papio Anubis
  • the antibody that binds to a human Siglec-8 and a non-human primate Siglec-8 binds to an epitope in Domain 1 of human Siglec-8.
  • Domain 1 of human Siglec-8 comprises the amino acid sequence of SEQ ID NO:112.
  • the antibody that binds to a human Siglec-8 and a non-human primate Siglec-8 binds to an epitope in Domain 3 of human Siglec-8.
  • Domain 3 of human Siglec-8 comprises the amino acid sequence of SEQ ID NO:114.
  • the antibody that binds to a human Siglec-8 and a non-human primate Siglec-8 is a humanized antibody, a chimeric antibody, or a human antibody. In some embodiments, the antibody that binds to a human Siglec-8 and a non-human primate Siglec-8 is a murine antibody. In some embodiments, the antibody that binds to a human Siglec-8 and a non-human primate Siglec-8 is a human IgG1 antibody. [0122] In one aspect, an anti-Siglec-8 antibody described herein is a monoclonal antibody.
  • an anti-Siglec-8 antibody described herein is an antibody fragment (including antigen-binding fragment), e.g., a Fab, Fab ⁇ -SH, Fv, scFv, or (Fab ⁇ )2 fragment.
  • an anti-Siglec-8 antibody described herein comprises an antibody fragment (including antigen- binding fragment), e.g., a Fab, Fab ⁇ -SH, Fv, scFv, or (Fab ⁇ )2 fragment.
  • an anti- Siglec-8 antibody described herein is a chimeric, humanized, or human antibody. In one aspect, any of the anti-Siglec-8 antibodies described herein are purified.
  • anti-Siglec-8 antibodies that compete with murine 2E2 antibody and murine 2C4 antibody binding to Siglec-8 are provided.
  • Anti-Siglec-8 antibodies that bind to the same epitope as murine 2E2 antibody and murine 2C4 antibody are also provided.
  • Murine antibodies to Siglec-8, 2E2 and 2C4 antibody are described in U.S. Pat. No.8,207,305; U.S. Pat. No.8,197,811, U.S. Pat. No.7,871,612, and U.S. Pat. No.7,557,191.
  • anti-Siglec-8 antibodies that compete with any anti-Siglec-8 antibody described herein (e.g., HEKA, HEKF, 1C3, 1H10, 4F11, 2C4, 2E2) for binding to Siglec-8 are provided.
  • Anti-Siglec-8 antibodies that bind to the same epitope as any anti-Siglec-8 antibody described herein e.g., HEKA, HEKF, 1C3, 1H10, 4F11, 2C4, 2E2 are also provided.
  • polynucleotides encoding anti-Siglec-8 antibodies are provided.
  • vectors comprising polynucleotides encoding anti-Siglec-8 antibodies are provided.
  • host cells comprising such vectors are provided.
  • compositions comprising anti- Siglec-8 antibodies or polynucleotides encoding anti-Siglec-8 antibodies are provided.
  • a composition of the present disclosure is a pharmaceutical formulation for the treatment of IBS and/or functional dyspepsia.
  • a composition of the present disclosure is a pharmaceutical formulation for the prevention of IBS and/or functional dyspepsia.
  • an anti-Siglec-8 antibody comprising 1, 2, 3, 4, 5, or 6 of the HVR sequences of the murine antibody 2C4.
  • an anti- Siglec-8 antibody comprising 1, 2, 3, 4, 5, or 6 of the HVR sequences of the murine antibody 2E2.
  • the HVR is a Kabat CDR or a Chothia CDR.
  • an anti-Siglec-8 antibody comprising 1, 2, 3, 4, 5, or 6 of the HVR sequences of the murine antibody 1C3.
  • an anti- Siglec-8 antibody comprising 1, 2, 3, 4, 5, or 6 of the HVR sequences of the murine antibody 4F11.
  • an anti-Siglec-8 antibody comprising 1, 2, 3, 4, 5, or 6 of the HVR sequences of the murine antibody 1H10.
  • the HVR is a Kabat CDR or a Chothia CDR.
  • the antibody described herein binds to an epitope in Domain 1 of human Siglec-8, wherein Domain 1 comprises the amino acid sequence of SEQ ID NO:112.
  • the antibody described herein binds to an epitope in Domain 2 of human Siglec-8, wherein Domain 2 comprises the amino acid sequence of SEQ ID NO:113.
  • the antibody described herein binds to an epitope in Domain 3 of human Siglec-8, wherein Domain 3 comprises the amino acid sequence of SEQ ID NO:114. [0129] In some embodiments, the antibody described herein binds to a fusion protein comprising the amino acid of SEQ ID NO:116 but not to a fusion protein comprising the amino acid of SEQ ID NO:115. In some embodiments, the antibody described herein binds to a fusion protein comprising the amino acid of SEQ ID NO:117 but not to a fusion protein comprising the amino acid of SEQ ID NO:115.
  • the antibody described herein binds to a fusion protein comprising the amino acid of SEQ ID NO:117 but not to a fusion protein comprising the amino acid of SEQ ID NO:116.
  • an anti-Siglec-8 antibody comprising a heavy chain variable region and a light chain variable region, wherein the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:88, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:91, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:94; and/or a light chain variable region comprising (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:97, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:100, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:103.
  • the antibody described herein binds to an epitope in Domain 2 of human Siglec-8, wherein Domain 2 comprises the amino acid sequence of SEQ ID NO: 113.
  • an anti-Siglec-8 antibody comprising a heavy chain variable region and a light chain variable region, wherein the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:89, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:92, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:95; and/or a light chain variable region comprising (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:98, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:101, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:104.
  • the antibody described herein binds to an epitope in Domain 3 of human Siglec-8, wherein Domain 3 comprises the amino acid sequence of SEQ ID NO: 114. In some embodiments, the antibody described herein binds to human Siglec-8 and non-human primate Siglec-8.
  • an anti-Siglec-8 antibody comprising a heavy chain variable region and a light chain variable region, wherein the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:90, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:93, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:96; and/or a light chain variable region comprising (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:99, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:102, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:105.
  • the antibody described herein binds to an epitope in Domain 1 of human Siglec-8, wherein Domain 1 comprises the amino acid sequence of SEQ ID NO: 112. In some embodiments, the antibody described herein binds to human Siglec-8 and non-human primate Siglec-8.
  • an anti-Siglec-8 antibody comprising a heavy chain variable region and a light chain variable region
  • the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:61, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:62, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:63
  • the light chain variable region comprises (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:64, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:65, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:66.
  • an anti-Siglec-8 antibody comprising a heavy chain variable region and a light chain variable region
  • the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:61, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:62, and (iii) HVR-H3 comprising the amino acid sequence selected from SEQ ID NOs:67-70; and/or wherein the light chain variable region comprises (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:64, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:65, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:66.
  • an anti-Siglec-8 antibody comprising a heavy chain variable region and a light chain variable region
  • the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:61, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:62, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:63
  • the light chain variable region comprises (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:64, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:65, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:71.
  • an anti-Siglec-8 antibody comprising a heavy chain variable region and a light chain variable region
  • the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:61, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:62, and (iii) HVR-H3 comprising the amino acid sequence selected from SEQ ID NOs:67-70; and/or wherein the light chain variable region comprises (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:64, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:65, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:71.
  • an anti-Siglec-8 antibody comprising a heavy chain variable region and a light chain variable region, wherein the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:88, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:91, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:94; and/or a light chain variable region comprising (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:97, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:100, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:103.
  • an anti-Siglec-8 antibody comprising a heavy chain variable region and a light chain variable region, wherein the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:89, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:92, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:95; and/or a light chain variable region comprising (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:98, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:101, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:104.
  • an anti-Siglec-8 antibody comprising a heavy chain variable region and a light chain variable region, wherein the heavy chain variable region comprises (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:90, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:93, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:96; and/or a light chain variable region comprising (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:99, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:102, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:105.
  • An anti-Siglec-8 antibody described herein may comprise any suitable framework variable domain sequence, provided that the antibody retains the ability to bind human Siglec-8.
  • heavy chain framework regions are designated “HC-FR1-FR4”
  • light chain framework regions are designated “LC-FR1-FR4.”
  • the anti-Siglec-8 antibody comprises a heavy chain variable domain framework sequence of SEQ ID NO:26, 34, 38, and 45 (HC-FR1, HC-FR2, HC-FR3, and HC-FR4, respectively).
  • the anti-Siglec-8 antibody comprises a light chain variable domain framework sequence of SEQ ID NO:48, 51, 55, and 60 (LC-FR1, LC-FR2, LC-FR3, and LC-FR4, respectively). In some embodiments, the anti-Siglec-8 antibody comprises a light chain variable domain framework sequence of SEQ ID NO:48, 51, 58, and 60 (LC-FR1, LC-FR2, LC-FR3, and LC-FR4, respectively).
  • an anti-Siglec-8 antibody comprises a heavy chain variable domain comprising a framework sequence and hypervariable regions, wherein the framework sequence comprises the HC-FR1-HC-FR4 sequences SEQ ID NOs:26-29 (HC-FR1), SEQ ID NOs:31-36 (HC-FR2), SEQ ID NOs:38-43 (HC-FR3), and SEQ ID NOs:45 or 46 (HC-FR4), respectively;
  • the HVR-H1 comprises the amino acid sequence of SEQ ID NO:61;
  • the HVR-H2 comprises the amino acid sequence of SEQ ID NO:62;
  • the HVR-H3 comprises an amino acid sequence of SEQ ID NO:63.
  • an anti-Siglec-8 antibody comprises a heavy chain variable domain comprising a framework sequence and hypervariable regions, wherein the framework sequence comprises the HC-FR1-HC-FR4 sequences SEQ ID NOs:26- 29 (HC-FR1), SEQ ID NOs:31-36 (HC-FR2), SEQ ID NOs:38-43 (HC-FR3), and SEQ ID NOs:45 or 46 (HC-FR4), respectively;
  • the HVR-H1 comprises the amino acid sequence of SEQ ID NO:61;
  • the HVR-H2 comprises the amino acid sequence of SEQ ID NO:62;
  • the HVR- H3 comprises an amino acid sequence selected from SEQ ID NOs:67-70.
  • an anti-Siglec-8 antibody comprises a light chain variable domain comprising a framework sequence and hypervariable regions, wherein the framework sequence comprises the LC-FR1- LC-FR4 sequences SEQ ID NOs:48 or 49 (LC-FR1), SEQ ID NOs:51-53 (LC-FR2), SEQ ID NOs:55-58 (LC-FR3), and SEQ ID NO:60 (LC-FR4), respectively;
  • the HVR-L1 comprises the amino acid sequence of SEQ ID NO:64;
  • the HVR-L2 comprises the amino acid sequence of SEQ ID NO:65;
  • the HVR-L3 comprises an amino acid sequence of SEQ ID NO:66.
  • an anti-Siglec-8 antibody comprises a light chain variable domain comprising a framework sequence and hypervariable regions, wherein the framework sequence comprises the LC-FR1-LC-FR4 sequences SEQ ID NOs:48 or 49 (LC-FR1), SEQ ID NOs:51-53 (LC-FR2), SEQ ID NOs:55-58 (LC-FR3), and SEQ ID NO:60 (LC-FR4), respectively;
  • the HVR-L1 comprises the amino acid sequence of SEQ ID NO:64;
  • the HVR-L2 comprises the amino acid sequence of SEQ ID NO:65;
  • the HVR-L3 comprises an amino acid sequence of SEQ ID NO:71.
  • the heavy chain variable domain comprises an amino acid sequence selected from SEQ ID NOs:2-10 and the light chain variable domain comprises and amino acid sequence selected from SEQ ID NOs:16-22. In one embodiment of these antibodies, the heavy chain variable domain comprises an amino acid sequence selected from SEQ ID NOs:2-10 and the light chain variable domain comprises and amino acid sequence selected from SEQ ID NOs:23 or 24. In one embodiment of these antibodies, the heavy chain variable domain comprises an amino acid sequence selected from SEQ ID NOs:11-14 and the light chain variable domain comprises and amino acid sequence selected from SEQ ID NOs:16- 22.
  • the heavy chain variable domain comprises an amino acid sequence selected from SEQ ID NOs:11-14 and the light chain variable domain comprises and amino acid sequence selected from SEQ ID NOs:23 or 24. In one embodiment of these antibodies, the heavy chain variable domain comprises an amino acid sequence of SEQ ID NO:6 and the light chain variable domain comprises and amino acid sequence of SEQ ID NO:16. In one embodiment of these antibodies, the heavy chain variable domain comprises an amino acid sequence of SEQ ID NO:6 and the light chain variable domain comprises and amino acid sequence of SEQ ID NO:21.
  • the heavy chain HVR sequences comprise the following: a) ( ( )) b) and c) ( ( Q ); (SEQ ID ); ( Q ); (SEQ ID NO:69); or (SEQ ID NO:70)).
  • the heavy chain HVR sequences comprise the following: a) H ( (SEQ ID NO:88); DYYMY (SEQ ID NO:89); or SSWMN (SEQ ID NO:90)); b) ; RIAPEDGDTEYAPKFQG ; and c) HVR-H3 (SEQ ID NO:95); or (SEQ ID NO:96)).
  • the heavy chain FR sequences comprise the following: a) HC-FR1 (EVQLVESGGGLVQPGGSLRLSCAASGFSLT (SEQ ID NO:26); Q Q ( Q ); ; or Q Q Q ( Q )); b) HC-FR2 (WVRQAPGKGLEWVS (SEQ ID NO:31); WVRQAPGKGLEWLG (SEQ ID NO:32); Q (SEQ ID NO: 33); WVRQAPGKGLEWVG (SEQ ID NO:34); WIRQPPGKGLEWIG (SEQ ID NO:35); or WVRQPPGKGLEWLG (SEQ ID NO:36)); c) ( Q (SEQ ID NO:38); Q ( Q ); Q ( Q ); RFSISKDNSKNTVYLQMNSLRAEDTAVYYCAR (SEQ ID NO41); or Q ( Q )); and d) HC-FR4 (WGQGTTVTVSS (SEQ ID NO:45);
  • the light chain HVR sequences comprise the following: a) (SEQ ID NO:64)); b) H V (S SN S (S Q ID NO:65)); and c) HVR-L ( ( ) ( )) [0146]
  • the light chain HVR sequences comprise the following: a) HVR-L1 (SASSSVSYMH (SEQ ID NO:97); RASQDITNYLN (SEQ ID NO:98); or SASSSVSYMY (SEQ ID NO:99)); b) HVR-L2 (DTSKLAY (SEQ ID NO:100); FTSRLHS (SEQ ID NO:101); or DTSSLAS (SEQ ID NO:102)); and c) HVR-L3 (QQWSSNPPT (SEQ ID NO:103); QQGNTLPWT (SEQ ID NO:104); or QQWNSDPYT (SEQ ID NO:105)).
  • the antibody comprises: a heavy chain variable region comprising (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:88, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:91, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:94; and/or a light chain variable region comprising (i) HVR-L1 comprising the amino acid sequence of SEQ ID NO:97, (ii) HVR-L2 comprising the amino acid sequence of SEQ ID NO:100, and (iii) HVR-L3 comprising the amino acid sequence of SEQ ID NO:103; a heavy chain variable region comprising (i) HVR-H1 comprising the amino acid sequence of SEQ ID NO:89, (ii) HVR-H2 comprising the amino acid sequence of SEQ ID NO:92, and (iii) HVR-H3 comprising the amino acid sequence of SEQ ID NO:95; and/or a heavy chain variable region comprising (i
  • the light chain FR sequences comprise the following: a) LC-FR1 ( or (SEQ ID NO:49)); b) ID NO:52); or c) L ( Q ); or ; and d) LC-FR4 (FGPGTKLDIK (SEQ ID NO:60)).
  • an anti-Siglec-8 antibody (e.g., a humanized anti-Siglec-8) antibody that binds to human Siglec-8, wherein the antibody comprises a heavy chain variable region and a light chain variable region, wherein the antibody comprises: (a) heavy chain variable domain comprising: (1) an HC-FR1 comprising the amino acid sequence selected from SEQ ID NOs:26-29; (2) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:61; (3) an HC-FR2 comprising the amino acid sequence selected from SEQ ID NOs:31-36; (4) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:62; (5) an HC-FR3 comprising the amino acid sequence selected from SEQ ID NOs:38-43; (6) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:63; and (7) an HC-FR4 comprising the amino acid sequence selected from SEQ ID NOs:45-46, and/
  • an anti-Siglec-8 antibody comprising a heavy chain variable domain selected from SEQ ID NOs:2-10 and/or comprising a light chain variable domain selected from SEQ ID NOs:16-22. In one aspect, provided herein is an anti-Siglec-8 antibody comprising a heavy chain variable domain selected from SEQ ID NOs:2-14 and/or comprising a light chain variable domain selected from SEQ ID NOs:16-24. In one aspect, provided herein is an anti-Siglec-8 antibody comprising a heavy chain variable domain selected from SEQ ID NOs:2-10 and/or comprising a light chain variable domain selected from SEQ ID NO:23 or 24.
  • an anti-Siglec-8 antibody comprising a heavy chain variable domain selected from SEQ ID NOs:11-14 and/or comprising a light chain variable domain selected from SEQ ID NOs:16-22.
  • an anti- Siglec-8 antibody comprising a heavy chain variable domain selected from SEQ ID NOs:11-14 and/or comprising a light chain variable domain selected from SEQ ID NO:23 or 24.
  • an anti-Siglec-8 antibody comprising a heavy chain variable domain of SEQ ID NO:6 and/or comprising a light chain variable domain selected from SEQ ID NO:16 or 21.
  • an anti-Siglec-8 antibody comprising a heavy chain variable domain selected from SEQ ID NOs:106-108 and/or comprising a light chain variable domain selected from SEQ ID NOs:109-111.
  • an anti-Siglec-8 antibody comprising a heavy chain variable domain of SEQ ID NO:106 and/or comprising a light chain variable domain of SEQ ID NO:109.
  • an anti-Siglec- 8 antibody comprising a heavy chain variable domain of SEQ ID NO:107 and/or comprising a light chain variable domain of SEQ ID NO:110.
  • an anti-Siglec- 8 antibody comprising a heavy chain variable domain of SEQ ID NO:108 and/or comprising a light chain variable domain of SEQ ID NO:111.
  • an anti-Siglec-8 antibody comprising a heavy chain variable domain comprising an amino acid sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to an amino acid sequence selected from SEQ ID NOs:2-14.
  • an anti-Siglec-8 antibody comprising a heavy chain variable domain comprising an amino acid sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to an amino acid sequence selected from SEQ ID NOs:106-108.
  • an amino acid sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity contains substitutions, insertions, or deletions relative to the reference sequence, but an antibody comprising that amino acid sequence retains the ability to bind to human Siglec-8.
  • an anti-Siglec-8 antibody comprises a heavy chain variable domain comprising an amino acid sequence of SEQ ID NO:6. In some embodiments, an anti-Siglec-8 antibody comprises a heavy chain variable domain comprising an amino acid sequence selected from SEQ ID NOs:106-108.
  • an anti-Siglec-8 antibody comprising a light chain variable domain comprising an amino acid sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to an amino acid sequence selected from SEQ ID NOs:16-24.
  • an anti-Siglec-8 antibody comprising a light chain variable domain comprising an amino acid sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to an amino acid sequence selected from SEQ ID NOs:109-111.
  • an amino acid sequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity contains substitutions, insertions, or deletions relative to the reference sequence, but an antibody comprising that amino acid sequence retains the ability to bind to human Siglec-8.
  • the substitutions, insertions, or deletions e.g., 1, 2, 3, 4, or 5 amino acids
  • an anti-Siglec-8 antibody comprises a light chain variable domain comprising an amino acid sequence of SEQ ID NO:16 or 21.
  • an anti-Siglec-8 antibody comprises a heavy chain variable domain comprising an amino acid sequence selected from SEQ ID NOs:109-111.
  • the present disclosure provides an anti-Siglec-8 antibody comprising (a) one, two, or three VH HVRs selected from those shown in Table 1 and/or (b) one, two, or three VL HVRs selected from those shown in Table 1.
  • the present disclosure provides an anti-Siglec-8 antibody comprising (a) one, two, or three VH HVRs selected from those shown in Table 2 and/or (b) one, two, or three VL HVRs selected from those shown in Table 2.
  • an anti-Siglec-8 antibody comprising (a) one, two, three or four VH FRs selected from those shown in Table 3 and/or (b) one, two, three or four VL FRs selected from those shown in Table 3.
  • an anti-Siglec-8 antibody comprising a heavy chain variable domain and/or a light chain variable domain of an antibody shown in Table 4, for example, HAKA antibody, HAKB antibody, HAKC antibody, etc. Table 1. Amino acid sequences of HVRs of antibodies
  • IgA immunoglobulins
  • IgD immunoglobulins
  • IgE immunoglobulins
  • IgG immunoglobulins
  • the J and D classes are further divided into subclasses e.g., humans express the following subclasses: IgG1, IgG2, IgG3, IgG4, IgA1 and IgA2.
  • IgG1 antibodies can exist in multiple polymorphic variants termed allotypes (reviewed in Jefferis and Lefranc 2009 mAbs Vol 1 Issue 41-7) any of which are suitable for use in some of the embodiments herein. Common allotypic variants in human populations are those designated by the letters a,f,n,z or combinations thereof.
  • the antibody may comprise a heavy chain Fc region comprising a human IgG Fc region.
  • the human IgG Fc region comprises a human IgG1 or IgG4.
  • the antibody is an IgG1 antibody.
  • the antibody is an IgG4 antibody.
  • the human IgG4 comprises the amino acid substitution S228P, wherein the amino acid residues are numbered according to the EU index as in Kabat.
  • the human IgG1 comprises the amino acid sequence of SEQ ID NO:78.
  • the human IgG4 comprises the amino acid sequence of SEQ ID NO:79.
  • an anti-Siglec-8 antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO:75; and/or a light chain comprising the amino acid sequence selected from SEQ ID NOs:76 or 77.
  • the antibody may comprise a heavy chain comprising the amino acid sequence of SEQ ID NO:87; and/or a light chain comprising the amino acid sequence of SEQ ID NO:76.
  • the anti-Siglec-8 antibody induces apoptosis of activated eosinophils.
  • the anti-Siglec-8 antibody induces apoptosis of resting eosinophils.
  • the anti-Siglec-8 antibody depletes activated eosinophils and inhibits mast cell activation. In some embodiments, the anti-Siglec-8 antibody depletes or reduces mast cells and inhibits mast cell activation. In some embodiments, the anti-Siglec-8 antibody depleted or reduces the number of mast cells. In some embodiments, the anti-Siglec-8 antibody kills mast cells by ADCC activity. In some embodiments, the antibody depletes or reduces mast cells expressing Siglec-8 in a tissue. In some embodiments, the antibody depletes or reduces mast cells expressing Siglec-8 in a biological fluid. 1.
  • an anti-Siglec-8 antibody described herein binds to human Siglec-8 with about the same or higher affinity and/or higher avidity as compared to mouse antibody 2E2 and/or mouse antibody 2C4.
  • an anti-Siglec-8 antibody provided herein has a dissociation constant (Kd) of ⁇ 1 ⁇ M, ⁇ 150 nM, ⁇ 100 nM, ⁇ 50 nM, ⁇ 10 nM, ⁇ 1 nM, ⁇ 0.1 nM, ⁇ 0.01 nM, or ⁇ 0.001 nM (e.g.10-8 M or less, e.g.
  • an anti-Siglec-8 antibody described herein binds to human Siglec-8 at about 1.5-fold, about 2- fold, about 3-fold, about 4-fold, about 5-fold, about 6-fold, about 7-fold, about 8-fold, about 9-fold or about 10-fold higher affinity than mouse antibody 2E2 and/or mouse antibody 2C4.
  • the anti-Siglec-8 antibody comprises a heavy chain variable region comprising the amino acid sequence of SEQ ID NO:6; and/or a light chain variable region comprising the amino acid sequence selected from SEQ ID NOs:16 or 21.
  • the binding affinity of the anti-Siglec-8 antibody can be determined by a surface plasmon resonance assay.
  • the Kd or Kd value can be measured by using a BIAcoreTM-2000 or a BIAcoreTM-3000 (BIAcore, Inc., Piscataway, N.J.) at 25° C with immobilized antigen CM5 chips at ⁇ 10 response units (RU).
  • carboxymethylated dextran biosensor chips (CM5, BIAcore® Inc.) are activated with N-ethyl- N ⁇ -(3-dimethylaminopropyl)-carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) according to the supplier's instructions.
  • Capture antibodies e.g., anti-human-Fc
  • 10 mM sodium acetate, pH 4.8 before injection at a flow rate of 30 ⁇ l/minute and further immobilized with an anti-Siglec-8 antibody.
  • biolayer interferometry may be used to determine the affinity of anti-Siglec-8 antibodies against Siglec-8.
  • Siglec-8-Fc tagged protein is immobilized onto anti-human capture sensors, and incubated with increasing concentrations of mouse, chimeric, or humanized anti-Siglec-8 Fab fragments to obtain affinity measurements using an instrument such as, for example, the Octet Red 384 System (ForteBio).
  • the binding affinity of the anti-Siglec-8 antibody can, for example, also be determined by the Scatchard analysis described in Munson et al., Anal. Biochem., 107:220 (1980) using standard techniques well known in the relevant art.
  • the binding avidity of the anti-Siglec-8 antibody can be determined by a surface plasmon resonance assay.
  • the Kd or Kd value can be measured by using a BIAcore T100.
  • Capture antibodies e.g., goat-anti-human-Fc and goat-anti- mouse-Fc
  • Flow-cells can be immobilized with anti-human or with anti-mouse antibodies.
  • the assay is conducted at a certain temperature and flow rate, for example, at 25oC at a flow rate of 30 ⁇ l/min.
  • Dimeric Siglec-8 is diluted in assay buffer at various concentrations, for example, at a concentration ranging from 15nM to 1.88pM.
  • Antibodies are captured and high performance injections are conducted, followed by dissociations.
  • Flow cells are regenerated with a buffer, for example, 50mM glycine pH 1.5. Results are blanked with an empty reference cell and multiple assay buffer injections, and analyzed with 1:1 global fit parameters. 3.
  • Competition Assays [0165] Competition assays can be used to determine whether two antibodies bind the same epitope by recognizing identical or sterically overlapping epitopes or one antibody competitively inhibits binding of another antibody to the antigen. These assays are known in the art.
  • antigen or antigen expressing cells is immobilized on a multi-well plate and the ability of unlabeled antibodies to block the binding of labeled antibodies is measured.
  • Common labels for such competition assays are radioactive labels or enzyme labels.
  • an anti- Siglec-8 antibody described herein competes with a 2E2 antibody described herein, for binding to the epitope present on the cell surface of a cell (e.g., a mast cell).
  • an anti-Siglec-8 antibody described herein competes with an antibody comprising a heavy chain variable domain comprising the amino acid sequence of SEQ ID NO:1, and a light chain variable region comprising the amino acid sequence of SEQ ID NO:15, for binding to the epitope present on the cell surface of a cell (e.g., a mast cell).
  • an anti- Siglec-8 antibody described herein competes with a 2C4 antibody described herein, for binding to the epitope present on the cell surface of a cell (e.g., a mast cell).
  • an anti-Siglec-8 antibody described herein competes with an antibody comprising a heavy chain variable domain comprising the amino acid sequence of SEQ ID NO:2 (as found in U.S. Pat. No. 8,207,305), and a light chain variable region comprising the amino acid sequence of SEQ ID NO:4 (as found in U.S. Pat. No.8,207,305), for binding to the epitope present on the cell surface of a cell (e.g., a mast cell).
  • Tm melting temperature
  • samples comprising a humanized anti-Siglec-8 antibody are incubated with a fluorescent dye (Sypro Orange) for 71 cycles with 1°C increase per cycle in a qPCR thermal cycler to determine the Tm.
  • the anti-Siglec-8 antibody has a similar or higher Tm as compared to mouse 2E2 antibody and/or mouse 2C4 antibody.
  • the anti-Siglec-8 antibody comprises a heavy chain variable region comprising the amino acid sequence of SEQ ID NO:6; and/or a light chain variable region comprising the amino acid sequence selected from SEQ ID NOs:16 or 21.
  • the anti-Siglec-8 antibody has the same or higher Tm as compared to a chimeric 2C4 antibody. In some embodiments, the anti-Siglec-8 antibody has the same or higher Tm as compared to an antibody having a heavy chain comprising the amino acid sequence of SEQ ID NO:84 and a light chain comprising the amino acid sequence of SEQ ID NO:85. 5. Biological Activity Assays [0167] In some embodiments, an anti-Siglec-8 antibody described herein depletes eosinophils and inhibits mast cells. Assays for assessing apoptosis of cells are well known in the art, for example staining with Annexin V and the TUNNEL assay.
  • an anti-Siglec-8 antibody described herein induces ADCC activity.
  • an anti-Siglec-8 antibody described herein kills eosinophils expressing Siglec-8 by ADCC activity.
  • a composition comprises non- fucosylated (i.e., afucosylated) anti-Siglec-8 antibodies.
  • a composition comprising non-fucosylated anti-Siglec-8 antibodies described herein enhances ADCC activity against Siglec-8 expressing eosinophils as compared to a composition comprising partially fucosylated anti-Siglec-8 antibodies. Assays for assessing ADCC activity are well known in the art and described herein.
  • effector cells and target cells are used.
  • effector cells include natural killer (NK) cells, large granular lymphocytes (LGL), lymphokine-activated killer (LAK) cells and PBMC comprising NK and LGL, or leukocytes having Fc receptors on the cell surfaces, such as neutrophils, eosinophils and macrophages.
  • NK natural killer
  • LGL large granular lymphocytes
  • LAK lymphokine-activated killer
  • PBMC comprising NK and LGL
  • leukocytes having Fc receptors on the cell surfaces such as neutrophils, eosinophils and macrophages.
  • Effector cells can be isolated from any source including individuals with a disease of interest (e.g., IBS and/or functional dyspepsia).
  • the target cell is any cell which expresses on the cell surface antigens that antibodies to be evaluated can recognize.
  • target cell is an eosinophil which expresses Siglec-8 on the cell surface.
  • a cell line e.g., Ramos cell line
  • Target cells can be labeled with a reagent that enables detection of cytolysis.
  • reagents for labeling include a radio-active substance such as sodium chromate (Na2 51 CrO 4 ). See, e.g., Immunology, 14, 181 (1968); J. Immunol. Methods., 172, 227 (1994); and J. Immunol. Methods., 184, 29 (1995).
  • human mast cells are isolated from human tissues or biological fluids according to published protocols (Guhl et al., Biosci. Biotechnol. Biochem., 2011, 75:382-384; Kulka et al., In Current Protocols in Immunology, 2001, (John Wiley & Sons, Inc.)) or differentiated from human hematopoietic stem cells, for example as described by Yokoi et al., J Allergy Clin Immunol., 2008, 121:499-505.
  • Purified mast cells are resuspended in Complete RPMI medium in a sterile 96-well U-bottom plate and incubated in the presence or absence of anti-Siglec-8 antibodies for 30 minutes at concentrations ranging between 0.0001 ng/ml and 10 Pg/ml. Samples are incubated for a further 4 to 48 hours with and without purified natural killer (NK) cells or fresh PBL to induce ADCC. Cell-killing by apoptosis or ADCC is analyzed by flow cytometry using fluorescent conjugated antibodies to detect mast cells (CD117 and FcHR1) and Annexin-V and 7AAD to discriminate live and dead or dying cells. Annexin-V and 7AAD staining are performed according to manufacturer’s instructions.
  • an anti-Siglec-8 antibody described herein inhibits mast cell-mediated activities.
  • Mast cell tryptase has been used as a biomarker for total mast cell number and activation.
  • total and active tryptase as well as histamine, N-methyl histamine, and 11-beta-prostaglandin F2 can be measured in blood or urine to assess the reduction in mast cells. See, e.g., U.S. Patent Application Publication No. US 20110293631 for an exemplary mast cell activity assay.
  • Antibody Preparation The antibody described herein (e.g., an antibody that binds to human Siglec-8) is prepared using techniques available in the art for generating antibodies, exemplary methods of which are described in more detail in the following sections.
  • the present disclosure encompasses antibody fragments. Antibody fragments may be generated by traditional means, such as enzymatic digestion, or by recombinant techniques. In certain circumstances there are advantages of using antibody fragments, rather than whole antibodies. For a review of certain antibody fragments, see Hudson et al. (2003) Nat. Med. 9:129-134. [0173] Various techniques have been developed for the production of antibody fragments.
  • F(ab ⁇ )2 fragments can be isolated directly from recombinant host cell culture.
  • Fab and F(ab ⁇ ) 2 fragment with increased in vivo half-life comprising salvage receptor binding epitope residues are described in U.S. Pat. No.5,869,046.
  • Other techniques for the production of antibody fragments will be apparent to the skilled practitioner.
  • an antibody is a single chain Fv fragment (scFv). See WO 93/16185; U.S. Pat. Nos.5,571,894; and 5,587,458.
  • Fv and scFv are the only species with intact combining sites that are devoid of constant regions; thus, they may be suitable for reduced nonspecific binding during in vivo use.
  • scFv fusion proteins may be constructed to yield fusion of an effector protein at either the amino or the carboxy terminus of an scFv. See Antibody Engineering, ed. Borrebaeck, supra.
  • the antibody fragment may also be a “linear antibody”, e.g., as described in U.S. Pat. No.5,641,870, for example. Such linear antibodies may be monospecific or bispecific.
  • Humanized Antibodies [0174] The present disclosure encompasses humanized antibodies. Various methods for humanizing non-human antibodies are known in the art.
  • a humanized antibody can have one or more amino acid residues introduced into it from a source which is non-human. These non-human amino acid residues are often referred to as “import” residues, which are typically taken from an “import” variable domain. Humanization can be essentially performed following the method of Winter (Jones et al. (1986) Nature 321:522-525; Riechmann et al. (1988) Nature 332:323-327; Verhoeyen et al. (1988) Science 239:1534-1536), by substituting hypervariable region sequences for the corresponding sequences of a human antibody. Accordingly, such “humanized” antibodies are chimeric antibodies (U.S. Pat.
  • humanized antibodies are typically human antibodies in which some hypervariable region residues and possibly some FR residues are substituted by residues from analogous sites in rodent antibodies.
  • the choice of human variable domains, both light and heavy, to be used in making the humanized antibodies can be important to reduce antigenicity. According to the so-called “best- fit” method, the sequence of the variable domain of a rodent (e.g., mouse) antibody is screened against the entire library of known human variable-domain sequences. The human sequence which is closest to that of the rodent is then accepted as the human framework for the humanized antibody (Sims et al.
  • Another method uses a particular framework derived from the consensus sequence of all human antibodies of a particular subgroup of light or heavy chains. The same framework may be used for several different humanized antibodies (Carter et al. (1992) Proc. Natl. Acad. Sci. USA, 89:4285; Presta et al. (1993) J. Immunol., 151:2623. [0176] It is further generally desirable that antibodies be humanized with retention of high affinity for the antigen and other favorable biological properties.
  • humanized antibodies are prepared by a process of analysis of the parental sequences and various conceptual humanized products using three-dimensional models of the parental and humanized sequences.
  • Three-dimensional immunoglobulin models are commonly available and are familiar to those, skilled in the art.
  • Computer programs are available which illustrate and display probable three-dimensional conformational structures of selected candidate immunoglobulin sequences. Inspection of these displays permits analysis of the likely role of the residues in the functioning of the candidate immunoglobulin sequence, i.e., the analysis of residues that influence the ability of the candidate immunoglobulin to bind its antigen.
  • FR residues can be selected and combined from the recipient and import sequences so that the desired antibody characteristic, such as increased affinity for the target antigen(s), is achieved.
  • Human anti-Siglec-8 antibodies of the present disclosure can be constructed by combining Fv clone variable domain sequence(s) selected from human-derived phage display libraries with known human constant domain sequences(s).
  • human monoclonal anti-Siglec-8 antibodies of the present disclosure can be made by the hybridoma method. Human myeloma and mouse-human heteromyeloma cell lines for the production of human monoclonal antibodies have been described, for example, by Kozbor J.
  • transgenic animals e.g., mice
  • JH antibody heavy-chain joining region
  • Bispecific antibodies are monoclonal antibodies that have binding specificities for at least two different antigens.
  • bispecific antibodies are human or humanized antibodies.
  • one of the binding specificities is for Siglec-8 and the other is for any other antigen.
  • bispecific antibodies may bind to two different epitopes of Siglec-8.
  • Bispecific antibodies may also be used to localize cytotoxic agents to cells which express Siglec-8.
  • Bispecific antibodies can be prepared as full length antibodies or antibody fragments (e.g. F(ab ⁇ ) 2 bispecific antibodies).
  • Methods for making bispecific antibodies are known in the art. See Milstein and Cuello, Nature, 305: 537 (1983),WO 93/08829 published May 13, 1993, and Traunecker et al., EMBO J., 10: 3655 (1991).
  • Bispecific antibodies include cross-linked or “heteroconjugate” antibodies.
  • an antibody of the present disclosure is a single-domain antibody.
  • a single-domain antibody is a single polypeptide chain comprising all or a portion of the heavy chain variable domain or all or a portion of the light chain variable domain of an antibody.
  • a single-domain antibody is a human single-domain antibody (Domantis, Inc., Waltham, Mass.; see, e.g., U.S. Pat. No.6,248,516 B1). In one embodiment, a single-domain antibody consists of all or a portion of the heavy chain variable domain of an antibody. 6. Antibody Variants [0183] In some embodiments, amino acid sequence modification(s) of the antibodies described herein are contemplated. For example, it may be desirable to improve the binding affinity and/or other biological properties of the antibody. Amino acid sequence variants of the antibody may be prepared by introducing appropriate changes into the nucleotide sequence encoding the antibody, or by peptide synthesis.
  • Such modifications include, for example, deletions from, and/or insertions into and/or substitutions of, residues within the amino acid sequences of the antibody. Any combination of deletion, insertion, and substitution can be made to arrive at the final construct, provided that the final construct possesses the desired characteristics.
  • the amino acid alterations may be introduced in the subject antibody amino acid sequence at the time that sequence is made.
  • a residue or group of target residues are identified (e.g., charged residues such as arg, asp, his, lys, and glu) and replaced by a neutral or negatively charged amino acid (e.g., alanine or polyalanine) to affect the interaction of the amino acids with antigen.
  • a neutral or negatively charged amino acid e.g., alanine or polyalanine
  • Those amino acid locations demonstrating functional sensitivity to the substitutions then are refined by introducing further or other variants at, or for, the sites of substitution.
  • the site for introducing an amino acid sequence variation is predetermined, the nature of the mutation per se need not be predetermined.
  • Amino acid sequence insertions include amino- and/or carboxyl-terminal fusions ranging in length from one residue to polypeptides containing a hundred or more residues, as well as intrasequence insertions of single or multiple amino acid residues.
  • terminal insertions include an antibody with an N-terminal methionyl residue.
  • Other insertional variants of the antibody molecule include the fusion to the N- or C-terminus of the antibody to an enzyme or a polypeptide which increases the serum half-life of the antibody.
  • monoclonal antibodies have a C-terminal cleavage at the heavy chain and/or light chain. For example, 1, 2, 3, 4, or 5 amino acid residues are cleaved at the C- terminus of heavy chain and/or light chain. In some embodiments, the C-terminal cleavage removes a C-terminal lysine from the heavy chain. In some embodiments, monoclonal antibodies have an N-terminal cleavage at the heavy chain and/or light chain. For example, 1, 2, 3, 4, or 5 amino acid residues are cleaved at the N-terminus of heavy chain and/or light chain. In some embodiments, truncated forms of monoclonal antibodies can be made by recombinant techniques.
  • an antibody of the present disclosure is altered to increase or decrease the extent to which the antibody is glycosylated.
  • Glycosylation of polypeptides is typically either N-linked or O-linked.
  • N-linked refers to the attachment of a carbohydrate moiety to the side chain of an asparagine residue.
  • the tripeptide sequences asparagine-X-serine and asparagine-X-threonine, where X is any amino acid except proline, are the recognition sequences for enzymatic attachment of the carbohydrate moiety to the asparagine side chain.
  • the presence of either of these tripeptide sequences in a polypeptide creates a potential glycosylation site.
  • O-linked glycosylation refers to the attachment of one of the sugars N- aceylgalactosamine, galactose, or xylose to a hydroxyamino acid, most commonly serine or threonine, although 5-hydroxyproline or 5-hydroxylysine may also be used.
  • Addition or deletion of glycosylation sites to the antibody is conveniently accomplished by altering the amino acid sequence such that one or more of the above-described tripeptide sequences (for N-linked glycosylation sites) is created or removed. The alteration may also be made by the addition, deletion, or substitution of one or more serine or threonine residues to the sequence of the original antibody (for O-linked glycosylation sites).
  • the carbohydrate attached thereto may be altered.
  • antibodies with a mature carbohydrate structure that lacks fucose attached to an Fc region of the antibody are described in US Pat Appl No US 2003/0157108 (Presta, L.). See also US 2004/0093621 (Kyowa Hakko Kogyo Co., Ltd).
  • Antibodies with a bisecting N- acetylglucosamine (GlcNAc) in the carbohydrate attached to an Fc region of the antibody are referenced in WO 2003/011878, Jean-Mairet et al. and U.S. Pat. No.6,602,684, Umana et al.
  • a glycosylation variant comprises an Fc region, wherein a carbohydrate structure attached to the Fc region lacks fucose. Such variants have improved ADCC function.
  • the Fc region further comprises one or more amino acid substitutions therein which further improve ADCC, for example, substitutions at positions 298, 333, and/or 334 of the Fc region (Eu numbering of residues).
  • Examples of publications related to “defucosylated” or “fucose-deficient” antibodies include: US 2003/0157108; WO 2000/61739; WO 2001/29246; US 2003/0115614; US 2002/0164328; US 2004/0093621; US 2004/0132140; US 2004/0110704; US 2004/0110282; US 2004/0109865; WO 2003/085119; WO 2003/084570; WO 2005/035586; WO 2005/035778; WO2005/053742; Okazaki et al.
  • Examples of cell lines producing defucosylated antibodies include Lec13 CHO cells deficient in protein fucosylation (Ripka et al. Arch. Biochem. Biophys.249:533-545 (1986); US Pat Appl No US 2003/0157108 A1, Presta, L; and WO 2004/056312 A1, Adams et al., especially at Example 11), and knockout cell lines, such as alpha-1,6-fucosyltransferase gene, FUT8, knockout CHO cells (Yamane- Ohnuki et al. Biotech.
  • Antibodies are contemplated herein that have reduced fucose relative to the amount of fucose on the same antibody produced in a wild-type CHO cell. For example, the antibody has a lower amount of fucose than it would otherwise have if produced by native CHO cells (e.g., a CHO cell that produce a native glycosylation pattern, such as, a CHO cell containing a native FUT8 gene).
  • native CHO cells e.g., a CHO cell that produce a native glycosylation pattern, such as, a CHO cell containing a native FUT8 gene.
  • an anti-Siglec-8 antibody provided herein is one wherein less than about 50%, 40%, 30%, 20%, 10%, 5% or 1% of the N-linked glycans thereon comprise fucose. In certain embodiments, an anti-Siglec-8 antibody provided herein is one wherein none of the N-linked glycans thereon comprise fucose, i.e., wherein the antibody is completely without fucose, or has no fucose or is non-fucosylated or is afucosylated.
  • the amount of fucose can be determined by calculating the average amount of fucose within the sugar chain at Asn297, relative to the sum of all glycostructures attached to Asn297 (e.g., complex, hybrid and high mannose structures) as measured by MALDI-TOF mass spectrometry, as described in WO 2008/077546, for example.
  • Asn297 refers to the asparagine residue located at about position 297 in the Fc region (Eu numbering of Fc region residues); however, Asn297 may also be located about ⁇ 3 amino acids upstream or downstream of position 297, i.e., between positions 294 and 300, due to minor sequence variations in antibodies.
  • the antibody is altered to improve its serum half-life.
  • a salvage receptor binding epitope into the antibody (especially an antibody fragment) as described in U.S. Pat. No.5,739,277, for example.
  • the term “salvage receptor binding epitope” refers to an epitope of the Fc region of an IgG molecule (e.g., IgG1, IgG2, IgG3, or IgG4) that is responsible for increasing the in vivo serum half-life of the IgG molecule (US 2003/0190311, U.S. Pat.
  • variants are amino acid substitution variants. These variants have at least one amino acid residue in the antibody molecule replaced by a different residue. Sites of interest for substitutional mutagenesis include the hypervariable regions, but FR alterations are also contemplated.
  • substitutions are shown in Table 5 under the heading of “preferred substitutions.” If such substitutions result in a desirable change in biological activity, then more substantial changes, denominated “exemplary substitutions” in Table 5, or as further described below in reference to amino acid classes, may be introduced and the products screened. Table 5.
  • Substantial modifications in the biological properties of the antibody are accomplished by selecting substitutions that differ significantly in their effect on maintaining (a) the structure of the polypeptide backbone in the area of the substitution, for example, as a sheet or helical conformation, (b) the charge or hydrophobicity of the molecule at the target site, or c) the bulk of the side chain. Amino acids may be grouped according to similarities in the properties of their side chains (in A. L.
  • Non-conservative substitutions will entail exchanging a member of one of these classes for another class. Such substituted residues also may be introduced into the conservative substitution sites or, into the remaining (non-conserved) sites.
  • One type of substitutional variant involves substituting one or more hypervariable region residues of a parent antibody (e.g., a humanized or human antibody). Generally, the resulting variant(s) selected for further development will have modified (e.g., improved) biological properties relative to the parent antibody from which they are generated.
  • a convenient way for generating such substitutional variants involves affinity maturation using phage display.
  • hypervariable region sites e.g., 6-7 sites
  • the antibodies thus generated are displayed from filamentous phage particles as fusions to at least part of a phage coat protein (e.g., the gene III product of M13) packaged within each particle.
  • the phage-displayed variants are then screened for their biological activity (e.g., binding affinity).
  • scanning mutagenesis e.g., alanine scanning
  • the Fc region variant may comprise a human Fc region sequence (e.g., a human IgG1, IgG2, IgG3 or IgG4 Fc region) comprising an amino acid modification (e.g., a substitution) at one or more amino acid positions including that of a hinge cysteine.
  • the Fc region variant comprises a human IgG4 Fc region.
  • the human IgG4 Fc region comprises the amino acid substitution S228P, wherein the amino acid residues are numbered according to the EU index as in Kabat.
  • an antibody of the present disclosure may comprise one or more alterations as compared to the wild type counterpart antibody, e.g. in the Fc region. These antibodies would nonetheless retain substantially the same characteristics required for therapeutic utility as compared to their wild type counterpart. For example, it is thought that certain alterations can be made in the Fc region that would result in altered (i.e., either improved or diminished) C1q binding and/or Complement Dependent Cytotoxicity (CDC), e.g., as described in WO99/51642. See also Duncan & Winter Nature 322:738-40 (1988); U.S. Pat. No. 5,648,260; U.S. Pat.
  • nucleic acid encoding it is isolated and inserted into a replicable vector for further cloning (amplification of the DNA) or for expression.
  • DNA encoding the antibody is readily isolated and sequenced using conventional procedures (e.g., by using oligonucleotide probes that are capable of binding specifically to genes encoding the heavy and light chains of the antibody).
  • Many vectors are available. The choice of vector depends in part on the host cell to be used. Generally, host cells are of either prokaryotic or eukaryotic (generally mammalian) origin.
  • constant regions of any isotype can be used for this purpose, including IgG, IgM, IgA, IgD, and IgE constant regions, and that such constant regions can be obtained from any human or animal species.
  • Generating Antibodies Using Prokaryotic Host Cells a) Vector Construction [0202] Polynucleotide sequences encoding polypeptide components of the antibody of the present disclosure can be obtained using standard recombinant techniques. Desired polynucleotide sequences may be isolated and sequenced from antibody producing cells such as hybridoma cells. Alternatively, polynucleotides can be synthesized using nucleotide synthesizer or PCR techniques.
  • sequences encoding the polypeptides are inserted into a recombinant vector capable of replicating and expressing heterologous polynucleotides in prokaryotic hosts.
  • Many vectors that are available and known in the art can be used for the purpose of the present disclosure. Selection of an appropriate vector will depend mainly on the size of the nucleic acids to be inserted into the vector and the particular host cell to be transformed with the vector. Each vector contains various components, depending on its function (amplification or expression of heterologous polynucleotide, or both) and its compatibility with the particular host cell in which it resides.
  • the vector components generally include, but are not limited to: an origin of replication, a selection marker gene, a promoter, a ribosome binding site (RBS), a signal sequence, the heterologous nucleic acid insert and a transcription termination sequence.
  • plasmid vectors containing replicon and control sequences which are derived from species compatible with the host cell are used in connection with these hosts.
  • the vector ordinarily carries a replication site, as well as marking sequences which are capable of providing phenotypic selection in transformed cells.
  • E. coli is typically transformed using pBR322, a plasmid derived from an E. coli species.
  • pBR322 contains genes- encoding ampicillin (Amp) and tetracycline (Tet) resistance and thus provides easy means for identifying transformed cells.
  • pBR322 its derivatives, or other microbial plasmids or bacteriophage may also contain, or be modified to contain, promoters which can be used by the microbial organism for expression of endogenous proteins. Examples of pBR322 derivatives used for expression of particular antibodies are described in detail in Carter et al., U.S. Pat. No. 5,648,237.
  • phage vectors containing replicon and control sequences that are compatible with the host microorganism can be used as transforming vectors in connection with these hosts.
  • the expression vector of the present disclosure may comprise two or more promoter- cistron pairs, encoding each of the polypeptide components.
  • a promoter is an untranslated regulatory sequence located upstream (5 ⁇ ) to a cistron that modulates its expression.
  • Prokaryotic promoters typically fall into two classes, inducible and constitutive. Inducible promoter is a promoter that initiates increased levels of transcription of the cistron under its control in response to changes in the culture condition, e.g. the presence or absence of a nutrient or a change in temperature.
  • promoters recognized by a variety of potential host cells are well known.
  • the selected promoter can be operably linked to cistron DNA encoding the light or heavy chain by removing the promoter from the source DNA via restriction enzyme digestion and inserting the isolated promoter sequence into the vector of the present disclosure.
  • Both the native promoter sequence and many heterologous promoters may be used to direct amplification and/or expression of the target genes.
  • heterologous promoters are utilized, as they generally permit greater transcription and higher yields of expressed target gene as compared to the native target polypeptide promoter.
  • Promoters suitable for use with prokaryotic hosts include the PhoA promoter, the ⁇ - galactamase and lactose promoter systems, a tryptophan (trp) promoter system and hybrid promoters such as the tac or the trc promoter.
  • trp tryptophan
  • other promoters that are functional in bacteria such as other known bacterial or phage promoters
  • Their nucleotide sequences have been published, thereby enabling a skilled worker operably to ligate them to cistrons encoding the target light and heavy chains (Siebenlist et al. (1980) Cell 20: 269) using linkers or adaptors to supply any required restriction sites.
  • each cistron within the recombinant vector comprises a secretion signal sequence component that directs translocation of the expressed polypeptides across a membrane.
  • the signal sequence may be a component of the vector, or it may be a part of the target polypeptide DNA that is inserted into the vector.
  • the signal sequence selected for the purpose of the present disclosure should be one that is recognized and processed (i.e. cleaved by a signal peptidase) by the host cell.
  • the signal sequence is substituted by a prokaryotic signal sequence selected, for example, from the group consisting of the alkaline phosphatase, penicillinase, Ipp, or heat-stable enterotoxin II (STII) leaders, LamB, PhoE, PelB, OmpA and MBP.
  • STII heat-stable enterotoxin II
  • LamB, PhoE, PelB, OmpA and MBP are STII signal sequences or variants thereof.
  • the production of the immunoglobulins according to the present disclosure can occur in the cytoplasm of the host cell, and therefore does not require the presence of secretion signal sequences within each cistron.
  • immunoglobulin light and heavy chains are expressed, folded and assembled to form functional immunoglobulins within the cytoplasm.
  • Certain host strains e.g., the E. coli trxB-strains
  • Antibodies of the present disclosure can also be produced by using an expression system in which the quantitative ratio of expressed polypeptide components can be modulated in order to maximize the yield of secreted and properly assembled antibodies of the present disclosure. Such modulation is accomplished at least in part by simultaneously modulating translational strengths for the polypeptide components.
  • One technique for modulating translational strength is disclosed in Simmons et al., U.S. Pat. No.5,840,523. It utilizes variants of the translational initiation region (TIR) within a cistron. For a given TIR, a series of amino acid or nucleic acid sequence variants can be created with a range of translational strengths, thereby providing a convenient means by which to adjust this factor for the desired expression level of the specific chain.
  • TIR translational initiation region
  • TIR variants can be generated by conventional mutagenesis techniques that result in codon changes which can alter the amino acid sequence.
  • changes in the nucleotide sequence are silent.
  • Alterations in the TIR can include, for example, alterations in the number or spacing of Shine-Dalgarno sequences, along with alterations in the signal sequence.
  • One method for generating mutant signal sequences is the generation of a “codon bank” at the beginning of a coding sequence that does not change the amino acid sequence of the signal sequence (i.e., the changes are silent). This can be accomplished by changing the third nucleotide position of each codon; additionally, some amino acids, such as leucine, serine, and arginine, have multiple first and second positions that can add complexity in making the bank.
  • a set of vectors is generated with a range of TIR strengths for each cistron therein. This limited set provides a comparison of expression levels of each chain as well as the yield of the desired antibody products under various TIR strength combinations.
  • TIR strengths can be determined by quantifying the expression level of a reporter gene as described in detail in Simmons et al. U.S. Pat. No.5,840,523. Based on the translational strength comparison, the desired individual TIRs are selected to be combined in the expression vector constructs of the present disclosure.
  • Prokaryotic host cells suitable for expressing antibodies of the present disclosure include Archaebacteria and Eubacteria, such as Gram-negative or Gram-positive organisms.
  • useful bacteria include Escherichia (e.g., E. coli), Bacilli (e.g., B. subtilis), Enterobacteria, Pseudomonas species (e.g., P. aeruginosa), Salmonella typhimurium, Serratia marcescans, Klebsiella, Proteus, Shigella, Rhizobia, Vitreoscilla, or Paracoccus.
  • gram-negative cells are used.
  • E. coli cells are used as hosts for the present disclosure. Examples of E.
  • coli strains include strain W3110 (Bachmann, Cellular and Molecular Biology, vol.2 (Washington, D.C.: American Society for Microbiology, 1987), pp.1190-1219; ATCC Deposit No.27,325) and derivatives thereof, including strain 33D3 having genotype W3110 ⁇ fhuA ( ⁇ tonA) ptr3 lac Iq lacL8 ⁇ ompT ⁇ (nmpc-fepE) degP41 kanR (U.S. Pat. No.5,639,635).
  • Other strains and derivatives thereof such as E. coli 294 (ATCC 31,446), E. coli B, E. coli ⁇ 1776 (ATCC 31,537) and E.
  • coli RV308(ATCC 31,608) are also suitable. These examples are illustrative rather than limiting. Methods for constructing derivatives of any of the above-mentioned bacteria having defined genotypes are known in the art and described in, for example, Bass et al., Proteins, 8:309-314 (1990). It is generally necessary to select the appropriate bacteria taking into consideration replicability of the replicon in the cells of a bacterium. For example, E. coli, Serratia, or Salmonella species can be suitably used as the host when well known plasmids such as pBR322, pBR325, pACYC177, or pKN410 are used to supply the replicon.
  • plasmids such as pBR322, pBR325, pACYC177, or pKN410 are used to supply the replicon.
  • Host cells are transformed with the above-described expression vectors and cultured in conventional nutrient media modified as appropriate for inducing promoters, selecting transformants, or amplifying the genes encoding the desired sequences.
  • Transformation means introducing DNA into the prokaryotic host so that the DNA is replicable, either as an extrachromosomal element or by chromosomal integrant. Depending on the host cell used, transformation is done using standard techniques appropriate to such cells. The calcium treatment employing calcium chloride is generally used for bacterial cells that contain substantial cell-wall barriers.
  • Prokaryotic cells used to produce the polypeptides of the present disclosure are grown in media known in the art and suitable for culture of the selected host cells. Examples of suitable media include luria broth (LB) plus necessary nutrient supplements. In some embodiments, the media also contains a selection agent, chosen based on the construction of the expression vector, to selectively permit growth of prokaryotic cells containing the expression vector. For example, ampicillin is added to media for growth of cells expressing ampicillin resistant gene.
  • any necessary supplements besides carbon, nitrogen, and inorganic phosphate sources may also be included at appropriate concentrations introduced alone or as a mixture with another supplement or medium such as a complex nitrogen source.
  • the culture medium may contain one or more reducing agents selected from the group consisting of glutathione, cysteine, cystamine, thioglycollate, dithioerythritol and dithiothreitol.
  • the prokaryotic host cells are cultured at suitable temperatures. In certain embodiments, for E. coli growth, growth temperatures range from about 20° C. to about 39° C.; from about 25° C. to about 37° C.; or about 30° C.
  • the pH of the medium may be any pH ranging from about 5 to about 9, depending mainly on the host organism. In certain embodiments, for E. coli, the pH is from about 6.8 to about 7.4, or about 7.0.
  • an inducible promoter is used in the expression vector of the present disclosure, protein expression is induced under conditions suitable for the activation of the promoter.
  • PhoA promoters are used for controlling transcription of the polypeptides. Accordingly, the transformed host cells are cultured in a phosphate-limiting medium for induction.
  • the phosphate-limiting medium is the C.R.A.P. medium (see, e.g., Simmons et al., J. Immunol.
  • the expressed polypeptides of the present disclosure are secreted into and recovered from the periplasm of the host cells. Protein recovery typically involves disrupting the microorganism, generally by such means as osmotic shock, sonication or lysis. Once cells are disrupted, cell debris or whole cells may be removed by centrifugation or filtration. The proteins may be further purified, for example, by affinity resin chromatography. Alternatively, proteins can be transported into the culture media and isolated therein. Cells may be removed from the culture and the culture supernatant being filtered and concentrated for further purification of the proteins produced.
  • the expressed polypeptides can be further isolated and identified using commonly known methods such as polyacrylamide gel electrophoresis (PAGE) and Western blot assay.
  • PAGE polyacrylamide gel electrophoresis
  • Western blot assay a commonly known method
  • antibody production is conducted in large quantity by a fermentation process.
  • Large-scale fed-batch fermentation procedures are available for production of recombinant proteins.
  • Large-scale fermentations have at least 1000 liters of capacity, and in certain embodiments, about 1,000 to 100,000 liters of capacity.
  • These fermentors use agitator impellers to distribute oxygen and nutrients, especially glucose.
  • Small scale fermentation refers generally to fermentation in a fermentor that is no more than approximately 100 liters in volumetric capacity, and can range from about 1 liter to about 100 liters.
  • induction of protein expression is typically initiated after the cells have been grown under suitable conditions to a desired density, e.g., an OD550 of about 180-220, at which stage the cells are in the early stationary phase.
  • a desired density e.g., an OD550 of about 180-220
  • inducers may be used, according to the vector construct employed, as is known in the art and described above. Cells may be grown for shorter periods prior to induction. Cells are usually induced for about 12-50 hours, although longer or shorter induction time may be used.
  • various fermentation conditions can be modified.
  • chaperone proteins such as Dsb proteins (DsbA, DsbB, DsbC, DsbD and or DsbG) or FkpA (a peptidylprolyl cis,trans-isomerase with chaperone activity) can be used to co-transform the host prokaryotic cells.
  • the chaperone proteins have been demonstrated to facilitate the proper folding and solubility of heterologous proteins produced in bacterial host cells. Chen et al. (1999) J. Biol. Chem.274:19601-19605; Georgiou et al., U.S. Pat.
  • host cell strains may be modified to effect genetic mutation(s) in the genes encoding known bacterial proteases such as Protease III, OmpT, DegP, Tsp, Protease I, Protease Mi, Protease V, Protease VI and combinations thereof.
  • E. coli protease-deficient strains are available and described in, for example, Joly et al. (1998), supra; Georgiou et al., U.S. Pat. No.5,264,365; Georgiou et al., U.S. Pat. No.5,508,192; Hara et al., Microbial Drug Resistance, 2:63-72 (1996).
  • E. coli protease-deficient strains are available and described in, for example, Joly et al. (1998), supra; Georgiou et al., U.S. Pat. No.5,264,365; Georgiou et al., U.S. Pat. No.5,508,192; Hara et
  • the antibody protein produced herein is further purified to obtain preparations that are substantially homogeneous for further assays and uses. Standard protein purification methods known in the art can be employed.
  • Protein A immobilized on a solid phase is used for immunoaffinity purification of the antibody products of the present disclosure.
  • Protein A is a 41 kD cell wall protein from Staphylococcus aureas which binds with a high affinity to the Fc region of antibodies. Lindmark et al (1983) J. Immunol.
  • the solid phase to which Protein A is immobilized can be a column comprising a glass or silica surface, or a controlled pore glass column or a silicic acid column. In some applications, the column is coated with a reagent, such as glycerol, to possibly prevent nonspecific adherence of contaminants.
  • a preparation derived from the cell culture as described above can be applied onto a Protein A immobilized solid phase to allow specific binding of the antibody of interest to Protein A. The solid phase would then be washed to remove contaminants non-specifically bound to the solid phase. Finally the antibody of interest is recovered from the solid phase by elution.
  • a vector for use in a eukaryotic host cell generally includes one or more of the following non-limiting components: a signal sequence, an origin of replication, one or more marker genes, an enhancer element, a promoter, and a transcription termination sequence.
  • a) Signal Sequence Component A vector for use in a eukaryotic host cell may also contain a signal sequence or other polypeptide having a specific cleavage site at the N-terminus of the mature protein or polypeptide of interest. The heterologous signal sequence selected may be one that is recognized and processed (i.e., cleaved by a signal peptidase) by the host cell.
  • mammalian signal sequences as well as viral secretory leaders, for example, the herpes simplex gD signal, are available.
  • the DNA for such a precursor region is ligated in reading frame to DNA encoding the antibody.
  • Origin of Replication Generally, an origin of replication component is not needed for mammalian expression vectors. For example, the SV40 origin may typically be used only because it contains the early promoter.
  • Selection Gene Component Expression and cloning vectors may contain a selection gene, also termed a selectable marker.
  • Typical selection genes encode proteins that (a) confer resistance to antibiotics or other toxins, e.g., ampicillin, neomycin, methotrexate, or tetracycline, (b) complement auxotrophic deficiencies, where relevant, or (c) supply critical nutrients not available from complex media.
  • antibiotics or other toxins e.g., ampicillin, neomycin, methotrexate, or tetracycline
  • b complement auxotrophic deficiencies, where relevant, or (c) supply critical nutrients not available from complex media.
  • One example of a selection scheme utilizes a drug to arrest growth of a host cell. Those cells that are successfully transformed with a heterologous gene produce a protein conferring drug resistance and thus survive the selection regimen. Examples of such dominant selection use the drugs neomycin, mycophenolic acid and hygromycin.
  • Suitable selectable markers for mammalian cells are those that enable the identification of cells competent to take up the antibody nucleic acid, such as DHFR, thymidine kinase, metallothionein-I and -II, primate metallothionein genes, adenosine deaminase, ornithine decarboxylase, etc.
  • DHFR thymidine kinase
  • metallothionein-I and -II primate metallothionein genes
  • adenosine deaminase ornithine decarboxylase, etc.
  • cells transformed with the DHFR selection gene are first identified by culturing all of the transformants in a culture medium that contains methotrexate (Mtx), a competitive antagonist of DHFR.
  • Mtx methotrexate
  • an appropriate host cell when wild-type DHFR is employed is the Chinese hamster ovary (CHO) cell line deficient in DHFR activity (e.g., ATCC CRL-9096).
  • CHO Chinese hamster ovary
  • host cells transformed or co-transformed with DNA sequences encoding an antibody, wild-type DHFR protein, and another selectable marker such as aminoglycoside 3 ⁇ -phosphotransferase (APH) can be selected by cell growth in medium containing a selection agent for the selectable marker such as an aminoglycosidic antibiotic, e.g., kanamycin, neomycin, or G418. See U.S. Pat. No.
  • Host cells may include NS0, CHOK1, CHOK1SV or derivatives, including cell lines deficient in glutamine synthetase (GS). Methods for the use of GS as a selectable marker for mammalian cells are described in U.S. Pat. No.5,122,464 and U.S. Pat. No.5,891,693.
  • GS glutamine synthetase
  • Methods for the use of GS as a selectable marker for mammalian cells are described in U.S. Pat. No.5,122,464 and U.S. Pat. No.5,891,693.
  • Promoter Component usually contain a promoter that is recognized by the host organism and is operably linked to nucleic acid encoding a polypeptide of interest (e.g., an antibody). Promoter sequences are known for eukaryotes.
  • AT-rich region located approximately 25 to 30 bases upstream from the site where transcription is initiated.
  • Another sequence found 70 to 80 bases upstream from the start of transcription of many genes is a CNCAAT region where N may be any nucleotide.
  • N may be any nucleotide.
  • AATAAA sequence At the 3 ⁇ end of most eukaryotic genes is an AATAAA sequence that may be the signal for addition of the poly A tail to the 3 ⁇ end of the coding sequence. In certain embodiments, any or all of these sequences may be suitably inserted into eukaryotic expression vectors.
  • Transcription from vectors in mammalian host cells is controlled, for example, by promoters obtained from the genomes of viruses such as polyoma virus, fowlpox virus, adenovirus (such as Adenovirus 2), bovine papilloma virus, avian sarcoma virus, cytomegalovirus, a retrovirus, hepatitis-B virus and Simian Virus 40 (SV40), from heterologous mammalian promoters, e.g., the actin promoter or an immunoglobulin promoter, from heat- shock promoters, provided such promoters are compatible with the host cell systems.
  • viruses such as polyoma virus, fowlpox virus, adenovirus (such as Adenovirus 2), bovine papilloma virus, avian sarcoma virus, cytomegalovirus, a retrovirus, hepatitis-B virus and Simian Virus 40 (SV40), from heterologous mamm
  • the early and late promoters of the SV40 virus are conveniently obtained as an SV40 restriction fragment that also contains the SV40 viral origin of replication.
  • the immediate early promoter of the human cytomegalovirus is conveniently obtained as a HindIII E restriction fragment.
  • a system for expressing DNA in mammalian hosts using the bovine papilloma virus as a vector is disclosed in U.S. Pat. No.4,419,446. A modification of this system is described in U.S. Pat. No.4,601,978.
  • Enhancer Element Component Transcription of DNA encoding an antibody of the present disclosure by higher eukaryotes is often increased by inserting an enhancer sequence into the vector. Many enhancer sequences are now known from mammalian genes (globin, elastase, albumin, ⁇ -fetoprotein, and insulin).
  • an enhancer from a eukaryotic cell virus examples include the SV40 enhancer on the late side of the replication origin (bp 100-270), the human cytomegalovirus early promoter enhancer, the mouse cytomegalovirus early promoter enhancer, the polyoma enhancer on the late side of the replication origin, and adenovirus enhancers. See also Yaniv, Nature 297:17-18 (1982) describing enhancer elements for activation of eukaryotic promoters.
  • the enhancer may be spliced into the vector at a position 5 ⁇ or 3 ⁇ to the antibody polypeptide-encoding sequence, but is generally located at a site 5 ⁇ from the promoter.
  • Expression vectors used in eukaryotic host cells may also contain sequences necessary for the termination of transcription and for stabilizing the mRNA. Such sequences are commonly available from the 5 ⁇ and, occasionally 3 ⁇ , untranslated regions of eukaryotic or viral DNAs or cDNAs. These regions contain nucleotide segments transcribed as polyadenylated fragments in the untranslated portion of the mRNA encoding an antibody.
  • One useful transcription termination component is the bovine growth hormone polyadenylation region. See WO94/11026 and the expression vector disclosed therein.
  • Suitable host cells for cloning or expressing the DNA in the vectors herein include higher eukaryote cells described herein, including vertebrate host cells. Propagation of vertebrate cells in culture (tissue culture) has become a routine procedure. Examples of useful mammalian host cell lines are monkey kidney CV1 line transformed by SV40 (COS-7, ATCC CRL 1651); human embryonic kidney line (293 or 293 cells subcloned for growth in suspension culture, Graham et al., J.
  • monkey kidney cells (CV1 ATCC CCL 70); African green monkey kidney cells (VERO-76, ATCC CRL-1587); human cervical carcinoma cells (HELA, ATCC CCL 2); canine kidney cells (MDCK, ATCC CCL 34); buffalo rat liver cells (BRL 3A, ATCC CRL 1442); human lung cells (W138, ATCC CCL 75); human liver cells (Hep G2, HB 8065); mouse mammary tumor (MMT 060562, ATCC CCL51); TRI cells (Mather et al., Annals N.Y. Acad.
  • Host cells are transformed with the above-described-expression or cloning vectors for antibody production and cultured in conventional nutrient media modified as appropriate for inducing promoters, selecting transformants, or amplifying the genes encoding the desired sequences. h) Culturing the Host Cells [0244]
  • the host cells used to produce an antibody of the present disclosure may be cultured in a variety of media.
  • Re.30,985 may be used as culture media for the host cells. Any of these media may be supplemented as necessary with hormones and/or other growth factors (such as insulin, transferrin, or epidermal growth factor), salts (such as sodium chloride, calcium, magnesium, and phosphate), buffers (such as HEPES), nucleotides (such as adenosine and thymidine), antibiotics (such as GENTAMYCINTM drug), trace elements (defined as inorganic compounds usually present at final concentrations in the micromolar range), and glucose or an equivalent energy source. Any other supplements may also be included at appropriate concentrations that would be known to those skilled in the art.
  • growth factors such as insulin, transferrin, or epidermal growth factor
  • salts such as sodium chloride, calcium, magnesium, and phosphate
  • buffers such as HEPES
  • nucleotides such as adenosine and thymidine
  • antibiotics such as GENTAMYCINTM drug
  • trace elements defined as in
  • the antibody can be produced intracellularly, or directly secreted into the medium. If the antibody is produced intracellularly, as a first step, the particulate debris, either host cells or lysed fragments, may be removed, for example, by centrifugation or ultrafiltration. Where the antibody is secreted into the medium, supernatants from such expression systems may be first concentrated using a commercially available protein concentration filter, for example, an Amicon or Millipore Pellicon ultrafiltration unit.
  • a commercially available protein concentration filter for example, an Amicon or Millipore Pellicon ultrafiltration unit.
  • a protease inhibitor such as PMSF may be included in any of the foregoing steps to inhibit proteolysis, and antibiotics may be included to prevent the growth of adventitious contaminants.
  • the antibody composition prepared from the cells can be purified using, for example, hydroxylapatite chromatography, gel electrophoresis, dialysis, and affinity chromatography, with affinity chromatography being a convenient technique.
  • affinity chromatography is a convenient technique.
  • the suitability of protein A as an affinity ligand depends on the species and isotype of any immunoglobulin Fc domain that is present in the antibody. Protein A can be used to purify antibodies that are based on human ⁇ 1, ⁇ 2, or ⁇ 4 heavy chains (Lindmark et al., J. Immunol. Methods 62:1-13 (1983)).
  • Protein G is recommended for all mouse isotypes and for human ⁇ 3 (Guss et al., EMBO J.5:15671575 (1986)).
  • the matrix to which the affinity ligand is attached may be agarose, but other matrices are available. Mechanically stable matrices such as controlled pore glass or poly(styrenedivinyl)benzene allow for faster flow rates and shorter processing times than can be achieved with agarose.
  • the antibody comprises a CH3 domain
  • the Bakerbond ABXTM resin J. T. Baker, Phillipsburg, N.J.
  • the mixture comprising the antibody of interest and contaminants may be subjected to further purification, for example, by low pH hydrophobic interaction chromatography using an elution buffer at a pH between about 2.5-4.5, performed at low salt concentrations (e.g., from about 0-0.25M salt).
  • various methodologies for preparing antibodies for use in research, testing, and clinical use are well-established in the art, consistent with the above-described methodologies and/or as deemed appropriate by one skilled in the art for a particular antibody of interest. Production of non-fucosylated antibodies [0249] Provided herein are methods for preparing antibodies with a reduced degree of fucosylation.
  • methods contemplated herein include, but are not limited to, use of cell lines deficient in protein fucosylation (e.g., Lec13 CHO cells, alpha-1,6-fucosyltransferase gene knockout CHO cells, cells overexpressing ⁇ 1,4-N-acetylglycosminyltransferase III and further overexpressing Golgi ⁇ -mannosidase II, etc.), and addition of a fucose analog(s) in a cell culture medium used for the production of the antibodies.
  • cell lines deficient in protein fucosylation e.g., Lec13 CHO cells, alpha-1,6-fucosyltransferase gene knockout CHO cells, cells overexpressing ⁇ 1,4-N-acetylglycosminyltransferase III and further overexpressing Golgi ⁇ -mannosidase II, etc.
  • Glycosidase inhibitors include ⁇ -glucosidase I, ⁇ -glucosidase II, and ⁇ -mannosidase I.
  • the glycosidase inhibitor is an inhibitor of ⁇ -mannosidase I (e.g., kifunensine).
  • core fucosylation refers to addition of fucose (“fucosylation”) to N- acetylglucosamine (“GlcNAc”) at the reducing terminal of an N-linked glycan.
  • fucose fucose
  • GlcNAc N- acetylglucosamine
  • fucosylation of complex N-glycoside-linked sugar chains bound to the Fc region (or domain) is reduced.
  • a “complex N-glycoside-linked sugar chain” is typically bound to asparagine 297 (according to the number of Kabat), although a complex N-glycoside linked sugar chain can also be linked to other asparagine residues.
  • a “complex N-glycoside-linked sugar chain” excludes a high mannose type of sugar chain, in which only mannose is incorporated at the non-reducing terminal of the core structure, but includes 1) a complex type, in which the non-reducing terminal side of the core structure has one or more branches of galactose-N-acetylglucosamine (also referred to as “gal-GlcNAc”) and the non-reducing terminal side of Gal-GlcNAc optionally has a sialic acid, bisecting N- acetylglucosamine or the like; or 2) a hybrid type, in which the non-reducing terminal side of the core structure has both branches of the high mannose N-glycoside-linked sugar chain and complex N-glycoside-linked sugar chain.
  • a complex type in which the non-reducing terminal side of the core structure has one or more branches of galactose-N-acetylglucosamine (also referred to as “gal-GlcNAc”) and the
  • the “complex N-glycoside-linked sugar chain” includes a complex type in which the non-reducing terminal side of the core structure has zero, one or more branches of galactose-N-acetylglucosamine (also referred to as “gal-GlcNAc”) and the non- reducing terminal side of Gal-GlcNAc optionally further has a structure such as a sialic acid, bisecting N-acetylglucosamine or the like.
  • gal-GlcNAc also referred to as “gal-GlcNAc”
  • Gal-GlcNAc optionally further has a structure such as a sialic acid, bisecting N-acetylglucosamine or the like.
  • less than about 60%, less than about 50%, less than about 40%, less than about 30%, less than about 20%, less than about 15%, less than about 10%, less than about 5%, or less than about 1% of the antibody has core fucosylation by fucose in a composition.
  • substantially none (i.e., less than about 0.5%) of the antibody has core fucosylation by fucose in a composition.
  • more than about 40%, more than about 50%, more than about 60%, more than about 70%, more than about 80%, more than about 90%, more than about 91%, more than about 92%, more than about 93%, more than about 94%, more than about 95%, more than about 96%, more than about 97%, more than about 98%, or more than about 99% of the antibody is nonfucosylated in a composition.
  • provided herein is an antibody wherein substantially none (i.e., less than about 0.5%) of the N-glycoside-linked carbohydrate chains contain a fucose residue.
  • an antibody wherein at least one or two of the heavy chains of the antibody is non-fucosylated.
  • a variety of mammalian host-expression vector systems can be utilized to express an antibody.
  • the culture media is not supplemented with fucose.
  • an effective amount of a fucose analog is added to the culture media.
  • an “effective amount” refers to an amount of the analog that is sufficient to decrease fucose incorporation into a complex N-glycoside-linked sugar chain of an antibody by at least about 10%, at least about 20%, at least about 30%, at least about 40% or at least about 50%.
  • antibodies produced by the instant methods comprise at least about 10%, at least about 20%, at least about 30%, at least about 40% or at least about 50% non-core fucosylated protein (e.g., lacking core fucosylation), as compared with antibodies produced from the host cells cultured in the absence of a fucose analog.
  • the content e.g., the ratio
  • sugar chains in which fucose is not bound to N- acetylglucosamine in the reducing end of the sugar chain versus sugar chains in which fucose is bound to N-acetylglucosamine in the reducing end of the sugar chain can be determined, for example, as described in the Examples.
  • compositions of the released sugar chains can be determined by analyzing the chains by the HPAEC-PAD method (see, e.g., J. Liq Chromatogr.6:1557 (1983)). (See generally U.S. Patent Application Publication No. 2004/0110282.).
  • compositions comprising any of the anti-Siglec-8 antibodies described herein (e.g., an antibody that binds to Siglec-8).
  • a composition comprising an anti- Siglec-8 antibody described herein, wherein the antibody comprises a Fc region and N- glycoside-linked carbohydrate chains linked to the Fc region, wherein less than about 50% of the N-glycoside-linked carbohydrate chains contain a fucose residue.
  • the antibody comprises a Fc region and N-glycoside-linked carbohydrate chains linked to the Fc region, wherein less than about 45%, about 40%, about 35%, about 30%, about 25%, about 20%, or about 15% of the N-glycoside-linked carbohydrate chains contain a fucose residue.
  • a composition comprising an anti-Siglec-8 antibody described herein, wherein the antibody comprises a Fc region and N-glycoside-linked carbohydrate chains linked to the Fc region, wherein substantially none of the N-glycoside-linked carbohydrate chains contain a fucose residue.
  • Therapeutic formulations are prepared for storage by mixing the active ingredient having the desired degree of purity with optional pharmaceutically acceptable carriers, excipients or stabilizers (Remington: The Science and Practice of Pharmacy, 20th Ed., Lippincott Williams & Wiklins, Pub., Gennaro Ed., Philadelphia, Pa.2000).
  • Acceptable carriers, excipients, or stabilizers are nontoxic to recipients at the dosages and concentrations employed, and include buffers, antioxidants including ascorbic acid, methionine, Vitamin E, sodium metabisulfite; preservatives, isotonicifiers, stabilizers, metal complexes (e.g., Zn-protein complexes); chelating agents such as EDTA and/or non-ionic surfactants.
  • Buffers can be used to control the pH in a range which optimizes the therapeutic effectiveness, especially if stability is pH dependent. Buffers can be present at concentrations ranging from about 50 mM to about 250 mM. Suitable buffering agents for use with the present disclosure include both organic and inorganic acids and salts thereof. For example, citrate, phosphate, succinate, tartrate, fumarate, gluconate, oxalate, lactate, acetate. Additionally, buffers may be comprised of histidine and trimethylamine salts such as Tris. [0260] Preservatives can be added to prevent microbial growth, and are typically present in a range from about 0.2%-1.0% (w/v).
  • Suitable preservatives for use with the present disclosure include octadecyldimethylbenzyl ammonium chloride; hexamethonium chloride; benzalkonium halides (e.g., chloride, bromide, iodide), benzethonium chloride; thimerosal, phenol, butyl or benzyl alcohol; alkyl parabens such as methyl or propyl paraben; catechol; resorcinol; cyclohexanol, 3-pentanol, and m-cresol.
  • Tonicity agents sometimes known as “stabilizers” can be present to adjust or maintain the tonicity of liquid in a composition.
  • tonicity agents When used with large, charged biomolecules such as proteins and antibodies, they are often termed “stabilizers” because they can interact with the charged groups of the amino acid side chains, thereby lessening the potential for inter and intra- molecular interactions.
  • Tonicity agents can be present in any amount between about 0.1% to about 25% by weight or between about 1 to about 5% by weight, taking into account the relative amounts of the other ingredients.
  • tonicity agents include polyhydric sugar alcohols, trihydric or higher sugar alcohols, such as glycerin, erythritol, arabitol, xylitol, sorbitol and mannitol.
  • Additional excipients include agents which can serve as one or more of the following: (1) bulking agents, (2) solubility enhancers, (3) stabilizers and (4) and agents preventing denaturation or adherence to the container wall.
  • excipients include: polyhydric sugar alcohols (enumerated above); amino acids such as alanine, glycine, glutamine, asparagine, histidine, arginine, lysine, ornithine, leucine, 2-phenylalanine, glutamic acid, threonine, etc.; organic sugars or sugar alcohols such as sucrose, lactose, lactitol, trehalose, stachyose, mannose, sorbose, xylose, ribose, ribitol, myoinisitose, myoinisitol, galactose, galactitol, glycerol, cyclitols (e.g., inosi
  • Non-ionic surfactants or detergents can be present to help solubilize the therapeutic agent as well as to protect the therapeutic protein against agitation-induced aggregation, which also permits the formulation to be exposed to shear surface stress without causing denaturation of the active therapeutic protein or antibody.
  • Non-ionic surfactants are present in a range of about 0.05 mg/ml to about 1.0 mg/ml or about 0.07 mg/ml to about 0.2 mg/ml. In some embodiments, non-ionic surfactants are present in a range of about 0.001% to about 0.1% w/v or about 0.01% to about 0.1% w/v or about 0.01% to about 0.025% w/v.
  • Suitable non-ionic surfactants include polysorbates (20, 40, 60, 65, 80, etc.), polyoxamers (184, 188, etc.), PLURONIC® polyols, TRITON®, polyoxyethylene sorbitan monoethers (TWEEN®-20, TWEEN®-80, etc.), lauromacrogol 400, polyoxyl 40 stearate, polyoxyethylene hydrogenated castor oil 10, 50 and 60, glycerol monostearate, sucrose fatty acid ester, methyl celluose and carboxymethyl cellulose.
  • Anionic detergents that can be used include sodium lauryl sulfate, dioctyle sodium sulfosuccinate and dioctyl sodium sulfonate.
  • Cationic detergents include benzalkonium chloride or benzethonium chloride.
  • the route of administration is in accordance with known and accepted methods, such as by single or multiple bolus or infusion over a long period of time in a suitable manner, e.g., injection or infusion by subcutaneous, intravenous, intraperitoneal, intramuscular, intraarterial, intralesional or intraarticular routes, topical administration, inhalation or by sustained release or extended-release means.
  • a composition or anti-Siglec-8 antibody of the present disclosure is administered by intravenous infusion once a month for 3 or more months.
  • a composition or anti-Siglec-8 antibody of the present disclosure is administered by intravenous infusion once per cycle (e.g., on Day 1) for 1, 2, 3, 4, 5, or 6 cycles, wherein each cycle is 1 month, 4 weeks, or 28 days.
  • the formulation herein may also contain more than one active compound as necessary for the particular indication being treated, preferably those with complementary activities that do not adversely affect each other. Such active compounds are suitably present in combination in amounts that are effective for the purpose intended.
  • IV. Articles of Manufacture or Kits [0268] In another aspect, an article of manufacture or kit is provided which comprises an anti- Siglec-8 antibody described herein (e.g., an antibody that binds human Siglec-8).
  • the article of manufacture or kit may further comprise instructions for use of the antibody in the methods of the present disclosure.
  • the article of manufacture or kit comprises instructions for the use of an anti-Siglec-8 antibody that binds to human Siglec-8 in methods for treating and/or preventing IBS and/or functional dyspepsia in an individual comprising administering to the individual an effective amount of an anti-Siglec-8 antibody that binds to human Siglec-8.
  • the article of manufacture comprises a medicament comprising an antibody that binds to human Siglec-8 and a package insert comprising instructions for administration of the medicament in an individual in need thereof to treat and/or prevent IBS and/or functional dyspepsia.
  • the package insert further indicates that the treatment is effective in reducing one or more symptoms in the individual with IBS and/or functional dyspepsia as compared to a baseline level before administration of the medicament.
  • the individual is diagnosed with IBS and/or functional dyspepsia before administration of the medicament comprising the antibody.
  • the individual is a human.
  • the article of manufacture or kit may further comprise a container. Suitable containers include, for example, bottles, vials (e.g., dual chamber vials), syringes (such as single or dual chamber syringes) and test tubes.
  • the container may be formed from a variety of materials such as glass or plastic. The container holds the formulation.
  • the article of manufacture or kit may further comprise a label or a package insert, which is on or associated with the container, may indicate directions for reconstitution and/or use of the formulation.
  • the label or package insert may further indicate that the formulation is useful or intended for subcutaneous, intravenous, or other modes of administration for treating and/or preventing IBS and/or functional dyspepsia in an individual.
  • the container holding the formulation may be a single-use vial or a multi-use vial, which allows for repeat administrations of the reconstituted formulation.
  • the article of manufacture or kit may further comprise a second container comprising a suitable diluent.
  • kits for a single dose- administration unit comprise a container of an aqueous formulation of therapeutic antibody, including both single or multi-chambered pre-filled syringes. Exemplary pre-filled syringes are available from Vetter GmbH, Ravensburg, Germany.
  • an article of manufacture or kit comprising the formulations described herein for administration in an auto-injector device.
  • An auto-injector can be described as an injection device that upon activation, will deliver its contents without additional necessary action from the patient or administrator. They are particularly suited for self-medication of therapeutic formulations when the delivery rate must be constant and the time of delivery is greater than a few moments.
  • an article of manufacture or kit which comprises an anti- Siglec-8 antibody described herein (e.g., an antibody that binds human Siglec-8).
  • the article of manufacture or kit may further comprise instructions for use of the antibody in the methods of the present disclosure.
  • the article of manufacture or kit comprises instructions for the use of an anti-Siglec-8 antibody that binds to human Siglec-8 in methods for treating or preventing IBS and/or functional dyspepsia in an individual comprising administering to the individual an effective amount of an anti-Siglec-8 antibody that binds to human Siglec-8.
  • the article of manufacture or kit comprises a medicament comprising an antibody that binds to human Siglec-8 and a package insert comprising instructions for administration of the medicament in an individual in need thereof to treat and/or prevent IBS and/or functional dyspepsia.
  • the present disclosure also provides an article of manufacture or kit which comprises an anti-Siglec-8 antibody described herein (e.g., an antibody that binds human Siglec-8) in combination with one or more additional medicament (e.g., a second medicament) for treating or preventing IBS and/or functional dyspepsia in an individual.
  • the article of manufacture or kit may further comprise instructions for use of the antibody in combination with one or more additional medicament in the methods of the present disclosure.
  • the article of manufacture or kit herein optionally further comprises a container comprising a second medicament, wherein the anti-Siglec-8 antibody is a first medicament, and which article or kit further comprises instructions on the label or package insert for treating the individual with the second medicament, in an effective amount.
  • the article of manufacture or kit comprises instructions for the use of an anti-Siglec-8 antibody that binds to human Siglec-8 in combination with one or more additional medicament in methods for treating or preventing IBS and/or functional dyspepsia in an individual.
  • the article of manufacture or kit comprises a medicament comprising an antibody that binds to human Siglec-8 (e.g., a first medicament), one or more additional medicament and a package insert comprising instructions for administration of the first medicament in combination with the one or more additional medicament (e.g., a second medicament).

Abstract

La présente invention concerne des méthodes de traitement du syndrome du côlon irritable (IBS) et/ou de la dyspepsie fonctionnelle. En particulier, la présente invention concerne des méthodes de traitement du syndrome du côlon irritable (IBS) et/ou de la dyspepsie fonctionnelle par l'intermédiaire de l'administration d'anticorps qui se lient à la Siglec-8 humaine ou de compositions comprenant lesdits anticorps. La présente invention concerne également des articles manufacturés ou des kits comprenant des anticorps qui se lient à la Siglec-8 humaine pour le traitement du syndrome du côlon irritable (IBS) et/ou de la dyspepsie fonctionnelle.
PCT/US2020/057174 2019-10-24 2020-10-23 Méthodes et compositions permettant de traiter le syndrome du côlon irritable et la dyspepsie fonctionnelle WO2021081411A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US17/770,439 US20220380460A1 (en) 2019-10-24 2020-10-23 Methods and compositions for treating irritable bowel syndrome and functional dyspepsia
EP20880322.1A EP4048698A4 (fr) 2019-10-24 2020-10-23 Méthodes et compositions permettant de traiter le syndrome du côlon irritable et la dyspepsie fonctionnelle
JP2022523912A JP2022553378A (ja) 2019-10-24 2020-10-23 過敏性腸症候群および機能性ディスペプシアを処置するための方法および組成物
CN202080087957.8A CN114829406A (zh) 2019-10-24 2020-10-23 治疗肠易激综合征和功能性消化不良的方法和组合物

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EP4048698A1 (fr) 2022-08-31

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